Question

simplifique (n+1)!×(n-2)/(n-1)!​

Answer 1

$\frac{(n + 1)! \times (n - 2)}{(n - 1)!} = \\ \frac{(n + 1) \times n\times (n - 1)! \times (n - 2)}{(n - 1)!} = \\ n(n + 1)( n- 2) = \\ {n}^{3} - {n}^{2} - 2n$