Question

Calcule o valor de C12,2

Answer 1

C12,5 = 12!/5!(12 - 5)! = 12!/5!(7)! = (12 x 11 x 10 x 9 x 8 x 7!)/5!.7!

C12,5 = (12 x 11 x 10 x 9 x 8)/(5 x 4 x 3 x 2 x 1)

C12,5 = 95040/120 = 792

Answer 2

C12,2 = 12! / 2! (10 - 2 )
C12,2 = 12 ! /2!8!
C12,2 = 12.11.10.9.8!/ 2.1. 8! eliminar os 8! ficando
C12,2 = 11 880/ 2 = 5 940