Question

Calcule

a) A7,3 =

B) C7,4 =

Answer 1

A7,3= 7x6x5 -> 210
Fórmula
7!/(7-3)!
7!/4!
7x6x5x4!/4!
7x6x5
210


C7,4= 7x6x5/3! -> 35
Fórmula:
7!/4!(7-4)!
7!/4!3!
7x6x5x4!/4!3!
7x6x5/3!
35