# Math Help - Can anyone show this exponential proof?

1. ## Can anyone show this exponential proof?

Can anyone show the following:

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

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?