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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Solve This Limit!!
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madmax (427)

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lt x tends to 0 ((1^x +2^x +......+ n^x)/n)^(a/x)


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thedumbheadwithnobrain (887)

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\displaystyle=\lim_{x\to0}e^{\frac{a}{x}.\left(\frac{1^x+2^x.....n^x}{n}-1\right)}\\=\lim_{x\to0}e^{\frac{a}{n}.\left(\frac{1^x-1}{x}+\frac{2^x-1}{x}.....\frac{n^x-1}{x}\right)}\\=e^{\frac{a}{n}.(ln1+ln2+ln3...ln(n)}\\=e^{\frac{a}{n}.ln(n!)}\\=(n!)^{\frac{a}{n}}


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madmax (427)

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again ....your answer is right but i'm totally confused with the method!! where did the "e" come from??


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thedumbheadwithnobrain (887)

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Result\Rightarrow \lim_{x\to0}f(x)^{g(x)}=e^{g(x)(f(x)-1)}\\\lim_{x\to0}(1+f(x)-1)^{g(x)}\\\lim_{x\to0}(1+[f(x)-1])^{\frac{1}{f(x)-1}.g(x)[f(x)-1]}\\\lim_{x\to0}e^{g(x)[f(x)-1]}\\(applied\;result\;\lim_{x\to0}(1+x)^{\frac{1}{x}}=e)

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madmax (427)

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Thank you so much!! But can U please say when this result is valid??


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thedumbheadwithnobrain (887)

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I\;think\;it\;is\;valid\;everywhere\\Since,I\;have\;applied\;a\;general\;result\\\lim_{x\to0}(1+x)^{\frac{1}{x}}=e\;is\;true\;everywhere.

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animal (615)

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yes i m also getting the same ans


 

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iitjee08aspirant (284)

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the formula whihc thedumbheadwithnobrains has applied is valid wen the function is of the form 1^infinity....
im talkin abt the formula used to solve the limit in frst step...

FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!

I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!



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