Why $ lim_nrightarrow infty fracn!n^k(n-k)! =1 $? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1Limits involving factorials $lim_Ntoinfty fracN!(N-k)!N^k$Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$Proof that $limlimits_h to infty frach!h^k(h-k)!=1 $ for any $ k $Evaluating $lim_nrightarrowinftyleft(1-fracxn^1+aright)^n$Computing $lim_nrightarrowinfty(1-fracxn)^-n$Dominated convergence theorem for complex-valued functions?Limit to Expectation: $ - lim_N rightarrow infty frac1N sum_n=1^N fracpartialpartial theta ln p(x_n|theta)$Evaluation of $lim_mtoinftyBig(F(e^-fraclambdam^2)Big)^m$ given $F(z)=frac1-sqrt1-z^2z$Compute $lim_nrightarrowinftyleft(fracn+1nright)^n^2cdotfrac1e^n.$Find $lim_nrightarrow inftyfrac(2n-1)!!(2n)!!.$Finding $limsup_nrightarrowinfty n^fraclog(n)n$How to prove $lim_n rightarrowinfty e^-nsum_k=0^nfracn^kk! = frac12$?Show: $lim_nrightarrow infty left|int_1^eleft[ln(x)right]^n:dx right|= 0 $

What can I do if my MacBook isn’t charging but already ran out?

Jazz greats knew nothing of modes. Why are they used to improvise on standards?

Can a non-EU citizen traveling with me come with me through the EU passport line?

Is there a service that would inform me whenever a new direct route is scheduled from a given airport?

How do I keep my slimes from escaping their pens?

When communicating altitude with a '9' in it, should it be pronounced "nine hundred" or "niner hundred"?

Mortgage adviser recommends a longer term than necessary combined with overpayments

Cold is to Refrigerator as warm is to?

Why is "Captain Marvel" translated as male in Portugal?

How to say that you spent the night with someone, you were only sleeping and nothing else?

What is the order of Mitzvot in Rambam's Sefer Hamitzvot?

Fishing simulator

Unable to start mainnet node docker container

How can I protect witches in combat who wear limited clothing?

Can a zero nonce be safely used with AES-GCM if the key is random and never used again?

grandmas drink with lemon juice

Why does tar appear to skip file contents when output file is /dev/null?

What LEGO pieces have "real-world" functionality?

Active filter with series inductor and resistor - do these exist?

Stop battery usage [Ubuntu 18]

If I can make up priors, why can't I make up posteriors?

How do I automatically answer y in bash script?

Is it possible to ask for a hotel room without minibar/extra services?

What do I do if technical issues prevent me from filing my return on time?



Why $ lim_nrightarrow infty fracn!n^k(n-k)! =1 $?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1Limits involving factorials $lim_Ntoinfty fracN!(N-k)!N^k$Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$Proof that $limlimits_h to infty frach!h^k(h-k)!=1 $ for any $ k $Evaluating $lim_nrightarrowinftyleft(1-fracxn^1+aright)^n$Computing $lim_nrightarrowinfty(1-fracxn)^-n$Dominated convergence theorem for complex-valued functions?Limit to Expectation: $ - lim_N rightarrow infty frac1N sum_n=1^N fracpartialpartial theta ln p(x_n|theta)$Evaluation of $lim_mtoinftyBig(F(e^-fraclambdam^2)Big)^m$ given $F(z)=frac1-sqrt1-z^2z$Compute $lim_nrightarrowinftyleft(fracn+1nright)^n^2cdotfrac1e^n.$Find $lim_nrightarrow inftyfrac(2n-1)!!(2n)!!}.$Finding $limsup_nrightarrowinfty n^{fraclog(n)n$How to prove $lim_n rightarrowinfty e^-nsum_k=0^nfracn^kk! = frac12$?Show: $lim_nrightarrow infty left|int_1^eleft[ln(x)right]^n:dx right|= 0 $










2












$begingroup$


I was on brilliant.org learning probability. There was a process explaining how the distribution of a Poisson Random Variable can be obtained from a Binomial Random Variable.



Consider the binomial distribution:



$$
beginequationbeginaligned
P(X=k) &=binom n k p^k (1-p)^n-k\
&=fracn!k!(n-k)! p^k (1-p)^n-k
endalignedendequation
$$


Substitute $m=np$ , or $p=fracmn$ :
$$
beginequationbeginaligned
P(X=k) &=fracn!k!(n-k)! left(fracmnright)^k left(1-fracmnright)^n-k\
&=fracn!k!(n-k)! fracm^kn^k left(1-fracmnright)^nleft(1-fracmnright)^-k
endalignedendequation
$$


Slightly rearrange
$$
beginequationbeginaligned
&=fracn!n^k(n-k)! left(1-fracmnright)^-kfracm^kk!left(1-fracmnright)^n
endalignedendequation
$$




Note that
$$
beginequationbeginaligned
& lim_nrightarrow infty fracn!n^k(n-k)! =1,quadlim_nrightarrow infty left(1-fracmnright)^-k =1,quad lim_nrightarrow infty left(1-fracmnright)^n =e^-m
endalignedendequation
$$




Thus, we have the final result which is equal to the formula for the Poisson distribution.



$$
=fracm^k e^-mk!
$$




In all these steps, what I don't understand is the following limit:
$$
lim_nrightarrow infty fracn!n^k(n-k)! =1
$$











share|cite|improve this question











$endgroup$











  • $begingroup$
    There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
    $endgroup$
    – Martin Sleziak
    yesterday











  • $begingroup$
    I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
    $endgroup$
    – Martin Sleziak
    yesterday










  • $begingroup$
    Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
    $endgroup$
    – billyandr
    yesterday











  • $begingroup$
    billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
    $endgroup$
    – Martin Sleziak
    yesterday















2












$begingroup$


I was on brilliant.org learning probability. There was a process explaining how the distribution of a Poisson Random Variable can be obtained from a Binomial Random Variable.



Consider the binomial distribution:



$$
beginequationbeginaligned
P(X=k) &=binom n k p^k (1-p)^n-k\
&=fracn!k!(n-k)! p^k (1-p)^n-k
endalignedendequation
$$


Substitute $m=np$ , or $p=fracmn$ :
$$
beginequationbeginaligned
P(X=k) &=fracn!k!(n-k)! left(fracmnright)^k left(1-fracmnright)^n-k\
&=fracn!k!(n-k)! fracm^kn^k left(1-fracmnright)^nleft(1-fracmnright)^-k
endalignedendequation
$$


Slightly rearrange
$$
beginequationbeginaligned
&=fracn!n^k(n-k)! left(1-fracmnright)^-kfracm^kk!left(1-fracmnright)^n
endalignedendequation
$$




Note that
$$
beginequationbeginaligned
& lim_nrightarrow infty fracn!n^k(n-k)! =1,quadlim_nrightarrow infty left(1-fracmnright)^-k =1,quad lim_nrightarrow infty left(1-fracmnright)^n =e^-m
endalignedendequation
$$




Thus, we have the final result which is equal to the formula for the Poisson distribution.



$$
=fracm^k e^-mk!
$$




In all these steps, what I don't understand is the following limit:
$$
lim_nrightarrow infty fracn!n^k(n-k)! =1
$$











share|cite|improve this question











$endgroup$











  • $begingroup$
    There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
    $endgroup$
    – Martin Sleziak
    yesterday











  • $begingroup$
    I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
    $endgroup$
    – Martin Sleziak
    yesterday










  • $begingroup$
    Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
    $endgroup$
    – billyandr
    yesterday











  • $begingroup$
    billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
    $endgroup$
    – Martin Sleziak
    yesterday













2












2








2


1



$begingroup$


I was on brilliant.org learning probability. There was a process explaining how the distribution of a Poisson Random Variable can be obtained from a Binomial Random Variable.



Consider the binomial distribution:



$$
beginequationbeginaligned
P(X=k) &=binom n k p^k (1-p)^n-k\
&=fracn!k!(n-k)! p^k (1-p)^n-k
endalignedendequation
$$


Substitute $m=np$ , or $p=fracmn$ :
$$
beginequationbeginaligned
P(X=k) &=fracn!k!(n-k)! left(fracmnright)^k left(1-fracmnright)^n-k\
&=fracn!k!(n-k)! fracm^kn^k left(1-fracmnright)^nleft(1-fracmnright)^-k
endalignedendequation
$$


Slightly rearrange
$$
beginequationbeginaligned
&=fracn!n^k(n-k)! left(1-fracmnright)^-kfracm^kk!left(1-fracmnright)^n
endalignedendequation
$$




Note that
$$
beginequationbeginaligned
& lim_nrightarrow infty fracn!n^k(n-k)! =1,quadlim_nrightarrow infty left(1-fracmnright)^-k =1,quad lim_nrightarrow infty left(1-fracmnright)^n =e^-m
endalignedendequation
$$




Thus, we have the final result which is equal to the formula for the Poisson distribution.



$$
=fracm^k e^-mk!
$$




In all these steps, what I don't understand is the following limit:
$$
lim_nrightarrow infty fracn!n^k(n-k)! =1
$$











share|cite|improve this question











$endgroup$




I was on brilliant.org learning probability. There was a process explaining how the distribution of a Poisson Random Variable can be obtained from a Binomial Random Variable.



Consider the binomial distribution:



$$
beginequationbeginaligned
P(X=k) &=binom n k p^k (1-p)^n-k\
&=fracn!k!(n-k)! p^k (1-p)^n-k
endalignedendequation
$$


Substitute $m=np$ , or $p=fracmn$ :
$$
beginequationbeginaligned
P(X=k) &=fracn!k!(n-k)! left(fracmnright)^k left(1-fracmnright)^n-k\
&=fracn!k!(n-k)! fracm^kn^k left(1-fracmnright)^nleft(1-fracmnright)^-k
endalignedendequation
$$


Slightly rearrange
$$
beginequationbeginaligned
&=fracn!n^k(n-k)! left(1-fracmnright)^-kfracm^kk!left(1-fracmnright)^n
endalignedendequation
$$




Note that
$$
beginequationbeginaligned
& lim_nrightarrow infty fracn!n^k(n-k)! =1,quadlim_nrightarrow infty left(1-fracmnright)^-k =1,quad lim_nrightarrow infty left(1-fracmnright)^n =e^-m
endalignedendequation
$$




Thus, we have the final result which is equal to the formula for the Poisson distribution.



$$
=fracm^k e^-mk!
$$




In all these steps, what I don't understand is the following limit:
$$
lim_nrightarrow infty fracn!n^k(n-k)! =1
$$








limits factorial






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited yesterday







billyandr

















asked 2 days ago









billyandrbillyandr

237




237











  • $begingroup$
    There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
    $endgroup$
    – Martin Sleziak
    yesterday











  • $begingroup$
    I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
    $endgroup$
    – Martin Sleziak
    yesterday










  • $begingroup$
    Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
    $endgroup$
    – billyandr
    yesterday











  • $begingroup$
    billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
    $endgroup$
    – Martin Sleziak
    yesterday
















  • $begingroup$
    There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
    $endgroup$
    – Martin Sleziak
    yesterday











  • $begingroup$
    I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
    $endgroup$
    – Martin Sleziak
    yesterday










  • $begingroup$
    Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
    $endgroup$
    – billyandr
    yesterday











  • $begingroup$
    billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
    $endgroup$
    – Martin Sleziak
    yesterday















$begingroup$
There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
$endgroup$
– Martin Sleziak
yesterday





$begingroup$
There are several posts about this: Why does $lim_ntoinfty fracn!(n-k)!n^k$ equal 1, Finding limit of sequence: $lim _n to infty fracn!n^k(n-k)!=1$, Proof that $limlimits_h to infty frach!h^k(h-k)!=1$ for any $k$, Limits involing Factorials $lim_Ntoinfty fracN!(N-k)!N^k$
$endgroup$
– Martin Sleziak
yesterday













$begingroup$
I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
$endgroup$
– Martin Sleziak
yesterday




$begingroup$
I found the posts in the above comment using Approach0. For some useful tips on searching here see: How to search on this site?
$endgroup$
– Martin Sleziak
yesterday












$begingroup$
Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
$endgroup$
– billyandr
yesterday





$begingroup$
Some of the other posts treating the same question painfully lack details and context. Maybe you'd want to put them on hold or close them.
$endgroup$
– billyandr
yesterday













$begingroup$
billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
$endgroup$
– Martin Sleziak
yesterday




$begingroup$
billyandr: If you actually have a look at those links, you can see that two of those posts are closed (as duplicates) now. Let me also say that the fact that you have added some more context to your question is certainly appreciated. (After all, that's what lead to reopening.)
$endgroup$
– Martin Sleziak
yesterday










2 Answers
2






active

oldest

votes


















6












$begingroup$

It is rather obvious if you cancel the factorials:



$$fracn!n^k(n-k)! =fracoverbracen(n-1)cdots (n-k+1)^k; factorsn^k= 1cdot left(1-frac1nright)cdots left(1-frack-1nright)stackreln to inftylongrightarrow 1$$






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Thank you so much. I didn't know it was right there under my eyes.
    $endgroup$
    – billyandr
    2 days ago










  • $begingroup$
    You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
    $endgroup$
    – trancelocation
    2 days ago



















2












$begingroup$

$$a_n=fracn!n^k(n-k)! implies log(a_n)=log(n!)-k log(n)-log((n-k)!)$$



Use Stirling approximation and continue with Taylor series to get
$$log(a_n)=frack(1-k)2 n+Oleft(frac1n^2right)$$ Continue with Taylor
$$a_n=e^log(a_n)=1+frack(1-k)2 n+Oleft(frac1n^2right)$$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    This has already a slight touch of overkill, hasn't it? :-)
    $endgroup$
    – trancelocation
    2 days ago










  • $begingroup$
    @trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
    $endgroup$
    – Claude Leibovici
    2 days ago












Your Answer








StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "69"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













draft saved

draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3185830%2fwhy-lim-n-rightarrow-infty-fracnnkn-k-1%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown

























2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









6












$begingroup$

It is rather obvious if you cancel the factorials:



$$fracn!n^k(n-k)! =fracoverbracen(n-1)cdots (n-k+1)^k; factorsn^k= 1cdot left(1-frac1nright)cdots left(1-frack-1nright)stackreln to inftylongrightarrow 1$$






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Thank you so much. I didn't know it was right there under my eyes.
    $endgroup$
    – billyandr
    2 days ago










  • $begingroup$
    You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
    $endgroup$
    – trancelocation
    2 days ago
















6












$begingroup$

It is rather obvious if you cancel the factorials:



$$fracn!n^k(n-k)! =fracoverbracen(n-1)cdots (n-k+1)^k; factorsn^k= 1cdot left(1-frac1nright)cdots left(1-frack-1nright)stackreln to inftylongrightarrow 1$$






share|cite|improve this answer









$endgroup$












  • $begingroup$
    Thank you so much. I didn't know it was right there under my eyes.
    $endgroup$
    – billyandr
    2 days ago










  • $begingroup$
    You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
    $endgroup$
    – trancelocation
    2 days ago














6












6








6





$begingroup$

It is rather obvious if you cancel the factorials:



$$fracn!n^k(n-k)! =fracoverbracen(n-1)cdots (n-k+1)^k; factorsn^k= 1cdot left(1-frac1nright)cdots left(1-frack-1nright)stackreln to inftylongrightarrow 1$$






share|cite|improve this answer









$endgroup$



It is rather obvious if you cancel the factorials:



$$fracn!n^k(n-k)! =fracoverbracen(n-1)cdots (n-k+1)^k; factorsn^k= 1cdot left(1-frac1nright)cdots left(1-frack-1nright)stackreln to inftylongrightarrow 1$$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered 2 days ago









trancelocationtrancelocation

14.1k1829




14.1k1829











  • $begingroup$
    Thank you so much. I didn't know it was right there under my eyes.
    $endgroup$
    – billyandr
    2 days ago










  • $begingroup$
    You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
    $endgroup$
    – trancelocation
    2 days ago

















  • $begingroup$
    Thank you so much. I didn't know it was right there under my eyes.
    $endgroup$
    – billyandr
    2 days ago










  • $begingroup$
    You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
    $endgroup$
    – trancelocation
    2 days ago
















$begingroup$
Thank you so much. I didn't know it was right there under my eyes.
$endgroup$
– billyandr
2 days ago




$begingroup$
Thank you so much. I didn't know it was right there under my eyes.
$endgroup$
– billyandr
2 days ago












$begingroup$
You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
$endgroup$
– trancelocation
2 days ago





$begingroup$
You are welcome. This "not seeing the obvious" just happens once in a while, I think, to all who do maths. So, it is good to have a math platform like this one. :-)
$endgroup$
– trancelocation
2 days ago












2












$begingroup$

$$a_n=fracn!n^k(n-k)! implies log(a_n)=log(n!)-k log(n)-log((n-k)!)$$



Use Stirling approximation and continue with Taylor series to get
$$log(a_n)=frack(1-k)2 n+Oleft(frac1n^2right)$$ Continue with Taylor
$$a_n=e^log(a_n)=1+frack(1-k)2 n+Oleft(frac1n^2right)$$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    This has already a slight touch of overkill, hasn't it? :-)
    $endgroup$
    – trancelocation
    2 days ago










  • $begingroup$
    @trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
    $endgroup$
    – Claude Leibovici
    2 days ago
















2












$begingroup$

$$a_n=fracn!n^k(n-k)! implies log(a_n)=log(n!)-k log(n)-log((n-k)!)$$



Use Stirling approximation and continue with Taylor series to get
$$log(a_n)=frack(1-k)2 n+Oleft(frac1n^2right)$$ Continue with Taylor
$$a_n=e^log(a_n)=1+frack(1-k)2 n+Oleft(frac1n^2right)$$






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    This has already a slight touch of overkill, hasn't it? :-)
    $endgroup$
    – trancelocation
    2 days ago










  • $begingroup$
    @trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
    $endgroup$
    – Claude Leibovici
    2 days ago














2












2








2





$begingroup$

$$a_n=fracn!n^k(n-k)! implies log(a_n)=log(n!)-k log(n)-log((n-k)!)$$



Use Stirling approximation and continue with Taylor series to get
$$log(a_n)=frack(1-k)2 n+Oleft(frac1n^2right)$$ Continue with Taylor
$$a_n=e^log(a_n)=1+frack(1-k)2 n+Oleft(frac1n^2right)$$






share|cite|improve this answer









$endgroup$



$$a_n=fracn!n^k(n-k)! implies log(a_n)=log(n!)-k log(n)-log((n-k)!)$$



Use Stirling approximation and continue with Taylor series to get
$$log(a_n)=frack(1-k)2 n+Oleft(frac1n^2right)$$ Continue with Taylor
$$a_n=e^log(a_n)=1+frack(1-k)2 n+Oleft(frac1n^2right)$$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered 2 days ago









Claude LeiboviciClaude Leibovici

126k1158135




126k1158135







  • 1




    $begingroup$
    This has already a slight touch of overkill, hasn't it? :-)
    $endgroup$
    – trancelocation
    2 days ago










  • $begingroup$
    @trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
    $endgroup$
    – Claude Leibovici
    2 days ago













  • 1




    $begingroup$
    This has already a slight touch of overkill, hasn't it? :-)
    $endgroup$
    – trancelocation
    2 days ago










  • $begingroup$
    @trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
    $endgroup$
    – Claude Leibovici
    2 days ago








1




1




$begingroup$
This has already a slight touch of overkill, hasn't it? :-)
$endgroup$
– trancelocation
2 days ago




$begingroup$
This has already a slight touch of overkill, hasn't it? :-)
$endgroup$
– trancelocation
2 days ago












$begingroup$
@trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
$endgroup$
– Claude Leibovici
2 days ago





$begingroup$
@trancelocation. You are totally right for the limit. One of my manias is to always look at the approach to the limit. Have a look at matheducators.stackexchange.com/questions/8339/… . Cheers :-)
$endgroup$
– Claude Leibovici
2 days ago


















draft saved

draft discarded
















































Thanks for contributing an answer to Mathematics Stack Exchange!


  • Please be sure to answer the question. Provide details and share your research!

But avoid


  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.

Use MathJax to format equations. MathJax reference.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3185830%2fwhy-lim-n-rightarrow-infty-fracnnkn-k-1%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







Popular posts from this blog

Get product attribute by attribute group code in magento 2get product attribute by product attribute group in magento 2Magento 2 Log Bundle Product Data in List Page?How to get all product attribute of a attribute group of Default attribute set?Magento 2.1 Create a filter in the product grid by new attributeMagento 2 : Get Product Attribute values By GroupMagento 2 How to get all existing values for one attributeMagento 2 get custom attribute of a single product inside a pluginMagento 2.3 How to get all the Multi Source Inventory (MSI) locations collection in custom module?Magento2: how to develop rest API to get new productsGet product attribute by attribute group code ( [attribute_group_code] ) in magento 2

Category:9 (number) SubcategoriesMedia in category "9 (number)"Navigation menuUpload mediaGND ID: 4485639-8Library of Congress authority ID: sh85091979ReasonatorScholiaStatistics

Magento 2.3: How do i solve this, Not registered handle, on custom form?How can i rewrite TierPrice Block in Magento2magento 2 captcha not rendering if I override layout xmlmain.CRITICAL: Plugin class doesn't existMagento 2 : Problem while adding custom button order view page?Magento 2.2.5: Overriding Admin Controller sales/orderMagento 2.2.5: Add, Update and Delete existing products Custom OptionsMagento 2.3 : File Upload issue in UI Component FormMagento2 Not registered handleHow to configured Form Builder Js in my custom magento 2.3.0 module?Magento 2.3. How to create image upload field in an admin form