Question

n + 3 fatorial dividido por n mais 1 fatorial

Answer 1

$\frac{(n+3)!}{(n+1)!} = \frac{(n+3)\cdot(n+2)\cdot(n+1)!}{(n+1)!} =(n+3)\cdot(n+2)=n^2+5n+6$