Monday, 2 January 2017

sequences and series - undersetnrightarrow+inftyoversetlimleft(sqrt[n]21right)n=0



Prove that:



limn+ (n21)n=0



I would like a solution without integral, limit of real functions or others advanced methods.
I thought \underset{n\rightarrow +\infty }{\overset{}{\lim }} \ 2\left(1- \frac{1}{\sqrt[n]2}\right)^{n} =0 but I don't know how to continue.


Answer




It is a limit of the form
0^{\infty}



so it is not an indeterminate form, it converges to 0.


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