# Thread: Can anyone show this exponential proof?

1. ## Can anyone show this exponential proof?

Can anyone show the following:

$\displaystyle N^N$$\displaystyle e^{-N} \displaystyle \leq \displaystyle e^{-1} x N! \displaystyle \leq N x \displaystyle N^N$$\displaystyle e^{-N}$

N.B. The "x" are multiplication signs

2. Use Stirling’s approximation.

3. I dont know how to use that? could you show me how its done?