Question

Calcule o valor de cada arranjo.
a) A6,2
b) A5,4
c) A8,4
d) A15,3

Answer 1

a) 6!/(6-2)! = 6.5.4!/4! = 6.5 = 30

b) 5!/(5-4)! = 5!/1! = 5!/1 = 5! = 5.4.3.2.1 = 120

c) 8!/(8-4)! = 8.7.6.5.4!/4! = 8.7.6.5 = 1680

d) 15!/(15-3)! = 15.14.13.12!/12! = 15.14.13 = 2730