Question

calculei os arranjos simples
a) A4,3

b)A18,3

c)A 12, 3

d)A5,2+A9,2

Answer 1

a) A 4,3 = 4!/(4-3)! = 4!/1! = 4! = 24

b) A 18,3 = 18! / (18-3)! = 18!/15! = 18x17x16 = 4896

c) A 12,3 = 12! / (12-3)! = 12!/9! = 12x11x10 = 1320

d) A 5,2 = 5! / 3! = 5x4 = 20
A 9,2 = 9! / 7! = 9 X 8 = 72
20 + 72 = 92