Question

BUNA. MA POATE AJUTA SI PE MINE CINEVA LA UN EX (n+1)!n! / (n-1)!(n+2)! multumesc frumos

Answer 1

$\frac{(n+1)!*n!}{(n-1)!*(n+2)!} = \frac{(n-1)!*n*(n+1)!}{(n-1)!*(n+1)!*(n+2)}= \frac{n}{n+2}$

Answer 2

$\displaystyle \mathtt{ \frac{(n+1)! \cdot n!}{(n-1)!\cdot (n+2)!} = \frac{n! \cdot (n+1) \cdot n \cdot(n-1)!}{(n-1)! \cdot n!\cdot(n+1)\cdot(n+2)}= \frac{n}{n+2} }$