Question Number 109619 by Dwaipayan Shikari last updated on 24/Aug/20
$$\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\frac{{n}!}{{n}^{{n}} } \\ $$
Commented by mnjuly1970 last updated on 24/Aug/20
$${please}\:{solve}\Uparrow\Uparrow \\ $$
Commented by mnjuly1970 last updated on 24/Aug/20