Using $lim_{nto 0}(1+n)^{x/n}=lim_{ntoinfty}left(1+frac{x}{n}right)^n$, show...












0












$begingroup$


I am having a huge brain fart while helping a 12 year old student at Mathnasium on this:



using the fact that



$$lim_{nto 0}(1+n)^{x/n} = lim_{ntoinfty}left(1 + frac{x}{n}right)^n$$



show that



$$lim_{ntoinfty}left(1 + frac{3}{4n}right)^n = 4 e^{3/2}$$



I know im missing something stupid probably, just some clever little analysis trick should do the job.










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  • 5




    $begingroup$
    I would rather have expected $e^{frac 34}$ ...
    $endgroup$
    – Hagen von Eitzen
    Jan 5 at 23:40










  • $begingroup$
    This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
    $endgroup$
    – Mindlack
    Jan 5 at 23:42












  • $begingroup$
    ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
    $endgroup$
    – Hossien Sahebjame
    Jan 6 at 0:10
















0












$begingroup$


I am having a huge brain fart while helping a 12 year old student at Mathnasium on this:



using the fact that



$$lim_{nto 0}(1+n)^{x/n} = lim_{ntoinfty}left(1 + frac{x}{n}right)^n$$



show that



$$lim_{ntoinfty}left(1 + frac{3}{4n}right)^n = 4 e^{3/2}$$



I know im missing something stupid probably, just some clever little analysis trick should do the job.










share|cite|improve this question











$endgroup$








  • 5




    $begingroup$
    I would rather have expected $e^{frac 34}$ ...
    $endgroup$
    – Hagen von Eitzen
    Jan 5 at 23:40










  • $begingroup$
    This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
    $endgroup$
    – Mindlack
    Jan 5 at 23:42












  • $begingroup$
    ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
    $endgroup$
    – Hossien Sahebjame
    Jan 6 at 0:10














0












0








0





$begingroup$


I am having a huge brain fart while helping a 12 year old student at Mathnasium on this:



using the fact that



$$lim_{nto 0}(1+n)^{x/n} = lim_{ntoinfty}left(1 + frac{x}{n}right)^n$$



show that



$$lim_{ntoinfty}left(1 + frac{3}{4n}right)^n = 4 e^{3/2}$$



I know im missing something stupid probably, just some clever little analysis trick should do the job.










share|cite|improve this question











$endgroup$




I am having a huge brain fart while helping a 12 year old student at Mathnasium on this:



using the fact that



$$lim_{nto 0}(1+n)^{x/n} = lim_{ntoinfty}left(1 + frac{x}{n}right)^n$$



show that



$$lim_{ntoinfty}left(1 + frac{3}{4n}right)^n = 4 e^{3/2}$$



I know im missing something stupid probably, just some clever little analysis trick should do the job.







calculus limits






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share|cite|improve this question













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edited Jan 5 at 23:47









Blue

47.7k870151




47.7k870151










asked Jan 5 at 23:35









Hossien SahebjameHossien Sahebjame

817




817








  • 5




    $begingroup$
    I would rather have expected $e^{frac 34}$ ...
    $endgroup$
    – Hagen von Eitzen
    Jan 5 at 23:40










  • $begingroup$
    This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
    $endgroup$
    – Mindlack
    Jan 5 at 23:42












  • $begingroup$
    ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
    $endgroup$
    – Hossien Sahebjame
    Jan 6 at 0:10














  • 5




    $begingroup$
    I would rather have expected $e^{frac 34}$ ...
    $endgroup$
    – Hagen von Eitzen
    Jan 5 at 23:40










  • $begingroup$
    This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
    $endgroup$
    – Mindlack
    Jan 5 at 23:42












  • $begingroup$
    ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
    $endgroup$
    – Hossien Sahebjame
    Jan 6 at 0:10








5




5




$begingroup$
I would rather have expected $e^{frac 34}$ ...
$endgroup$
– Hagen von Eitzen
Jan 5 at 23:40




$begingroup$
I would rather have expected $e^{frac 34}$ ...
$endgroup$
– Hagen von Eitzen
Jan 5 at 23:40












$begingroup$
This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
$endgroup$
– Mindlack
Jan 5 at 23:42






$begingroup$
This looks false. $(1+3/(4n))^n$ has the same limit at $infty$ at $((1+1/n)^n)^{3/4}$ which converges to $e^{3/4}$.
$endgroup$
– Mindlack
Jan 5 at 23:42














$begingroup$
ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
$endgroup$
– Hossien Sahebjame
Jan 6 at 0:10




$begingroup$
ok I went through this thought process too, so it is most likely a typo. These curriculum sheets are the only ones with no answer key as they have been custom built for a very advanced 12 year old student. Thanks so much, we spent so much time spinning in circles.
$endgroup$
– Hossien Sahebjame
Jan 6 at 0:10










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$begingroup$

Can do let $k = frac{4}{3}n $. Then as $n to infty$ certainly $k to infty$ and moreover



$$ lim_{k to infty} (1 + 1/k)^{3/4 k } = (lim_{k to infty} (1 + 1/k)^{1/k})^{3/4} = e^{3/4} $$






share|cite|improve this answer









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    1 Answer
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    1 Answer
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    active

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    2












    $begingroup$

    Can do let $k = frac{4}{3}n $. Then as $n to infty$ certainly $k to infty$ and moreover



    $$ lim_{k to infty} (1 + 1/k)^{3/4 k } = (lim_{k to infty} (1 + 1/k)^{1/k})^{3/4} = e^{3/4} $$






    share|cite|improve this answer









    $endgroup$


















      2












      $begingroup$

      Can do let $k = frac{4}{3}n $. Then as $n to infty$ certainly $k to infty$ and moreover



      $$ lim_{k to infty} (1 + 1/k)^{3/4 k } = (lim_{k to infty} (1 + 1/k)^{1/k})^{3/4} = e^{3/4} $$






      share|cite|improve this answer









      $endgroup$
















        2












        2








        2





        $begingroup$

        Can do let $k = frac{4}{3}n $. Then as $n to infty$ certainly $k to infty$ and moreover



        $$ lim_{k to infty} (1 + 1/k)^{3/4 k } = (lim_{k to infty} (1 + 1/k)^{1/k})^{3/4} = e^{3/4} $$






        share|cite|improve this answer









        $endgroup$



        Can do let $k = frac{4}{3}n $. Then as $n to infty$ certainly $k to infty$ and moreover



        $$ lim_{k to infty} (1 + 1/k)^{3/4 k } = (lim_{k to infty} (1 + 1/k)^{1/k})^{3/4} = e^{3/4} $$







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered Jan 5 at 23:40









        Jimmy SabaterJimmy Sabater

        2,066219




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