Question

Como Calcular? 2! + 3!:

Answer 1

$\Large\boxed{\begin{array}{l}\underline{\sf De~\!\!finic_{\!\!,}\tilde ao\,de\,fatorial}\\\rm n!=\begin{cases}\rm 1,~~se~n=0~~ou~~n=1\\\rm n\cdot(n-1)\cdot(n-2)\dotsc3\cdot2\cdot1,se~~n\geqslant2\end{cases}\end{array}}$

$\large\boxed{\begin{array}{l}\rm 2!+3!\\\rm 2!=2\cdot1=2\\\rm 3!=3\cdot2\cdot1=6\\\rm 2!+3!=2+6=8\end{array}}$