Question

calcule ou simplifique: (n+3)! . (n-1)!
(n-2)! (n+2)!

Answer 1

(n+3)(n+2)! (n-1)(n-2)! = (n+3).(n-1) = n² + 3n - n - 3 = n² + 2n - 3
(n-2)!(n+2)!