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Mathematics 17 Online
rishavraj (rishavraj):

question below

rishavraj (rishavraj):

is \[\lim_{n \rightarrow \infty}(\frac{ n }{ 1 + n })^n = e\]

rishavraj (rishavraj):

@mathmath333 here u go

OpenStudy (mathmath333):

r u asking its derivation or true or false

OpenStudy (mathmath333):

as per wolfram the answer is \(\large \dfrac{1}{e}\)

rishavraj (rishavraj):

yeah all because \[\lim_{n \rightarrow \infty }(\frac{ 1+n }{ n })^{-n} = \frac{ 1 }{e } \]

OpenStudy (mathmath333):

actually its \( \large \lim_{n \rightarrow \infty }\large \left(\dfrac{ 1+n }{ n }\right)^{-n} = e\)

rishavraj (rishavraj):

now how is tht possible??

OpenStudy (mathmath333):

wolfram gave it

OpenStudy (mathmath333):

as per my experience wolfram is a supercomp and 99.99% correct

rishavraj (rishavraj):

nope wolfram is showing 1/e

rishavraj (rishavraj):

http://prntscr.com/ak1imr

rishavraj (rishavraj):

@mathmath333 we got the values of different questions lol

OpenStudy (mathmath333):

OpenStudy (mathmath333):

|dw:1458943585393:dw|

OpenStudy (mathmath333):

its the opposite of what u posted

rishavraj (rishavraj):

@mathmath333 thanks bruh..I guess I got it ..... though u might get notifications after like 7 hrs after my roommate is awake -_-

OpenStudy (mathmath333):

i got it now

rishavraj (rishavraj):

hold on .... why do we do tht ??

rishavraj (rishavraj):

like to solve tht we convert it in the form \[\lim_{n \rightarrow \infty}(\frac{ 1+n }{ n })^{-n}~~~then ~~we~~get~~the ~value~~\frac{ 1 }{ e }\]

rishavraj (rishavraj):

@mathmath333 u gone -_-

rishavraj (rishavraj):

cant we solve tht without converting ??? :/

rishavraj (rishavraj):

@mathmath333 nevermind....this time I am sure.... thanks again :))

rishavraj (rishavraj):

http://prntscr.com/ak22b2 hav a look ...wht would be the next step ??

rishavraj (rishavraj):

it wont even let me Go Pro >_<

OpenStudy (mathmath333):

do u understand that \(\text{"exp"}\)

rishavraj (rishavraj):

yupppp

rishavraj (rishavraj):

it means \[\lim_{n \rightarrow \infty} e^{n \log\frac{ n }{ 1+n }}\]

OpenStudy (mathmath333):

i forgot that "exp" hence facing difficulty understanding

rishavraj (rishavraj):

wht would be the next step ??

rishavraj (rishavraj):

@mathmath333 u gotta be kidding me -_- *facepalm

rishavraj (rishavraj):

@mathmath333 so it would be \[\lim_{n \rightarrow \infty} \frac{ e^{n \log n} }{ e^{n \log(n +1)} }\]

rishavraj (rishavraj):

lemme know if it makes sense

OpenStudy (mathmath333):

\(\large \color{black}{\begin{align} & \lim_{n \rightarrow \infty} \left((\dfrac{ n }{ 1 + n }\right))^{n} \hspace{.33em}\\~\\ & \lim_{n \rightarrow \infty} \text{exp}\log\left(\dfrac{ n }{ 1 + n }\right)^{n} \hspace{.33em}\\~\\ & \lim_{n \rightarrow \infty} \text{exp}n\log\left(\dfrac{ n }{ 1 + n }\right) \hspace{.33em}\\~\\ & \text{exp} \left[\lim_{n \rightarrow \infty} n\log\left(\dfrac{ n }{ 1 + n }\right) \right]\hspace{.33em}\\~\\ \end{align}}\) try this

rishavraj (rishavraj):

@mathmath333 tbh I m blank ..so u need to walk me through this

OpenStudy (mathmath333):

\(\large \color{black}{\begin{align} & \lim_{n \rightarrow \infty} \left((\dfrac{ n }{ 1 + n }\right))^{n} \hspace{.33em}\\~\\ & =\lim_{n \rightarrow \infty} \text{exp}\left(\log\left(\dfrac{ n }{ 1 + n }\right)^{n}\right) \hspace{.33em}\\~\\ &= \lim_{n \rightarrow \infty} \text{exp}\left(n\log\left(\dfrac{ n }{ 1 + n }\right)\right) \hspace{.33em}\\~\\ & =\text{exp} \lim_{n \rightarrow \infty} \left(n\log\left(\dfrac{ n }{ 1 + n }\right) \right) \hspace{.33em}\\~\\ \end{align}}\)

rishavraj (rishavraj):

okkk go onnn .....I got it till here

rishavraj (rishavraj):

@mathmath333 really thanks a lot.... I got it ..... this time its solved for sure ..... again thanks a lot :)) I really appreciate it

OpenStudy (mathmath333):

bloody latex

OpenStudy (mathmath333):

lol i was typing, latex betrayed me

OpenStudy (mathmath333):

just apply L'hopital rest is cake walk

rishavraj (rishavraj):

lol yeah .... :P

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