Question

Simplifique:
A) 5!
3!

B) n!
(n -1)!

C) (n-1)!
(n -3)!

D) 7!
3!.4! ​

Answer 1

A) 5x4x3!/3! = 5x4 = 20

B) (n - 1)(n - 2)(n - 3)!/(n - 3)! = (n -1)(n - 2)

C) 7x6x5x4x3!/3x2x4x3! = 7x5x4 = 140.