Question

Calcule: A) 3.6!
B) 7!-5!
C)3!+2!/5!
D) 7!/8!
E) (n-3)!/(n-2)!
F) A6,4
G) P9

Answer 1

a) 3.6! = 3.6.5.4.3.2.1 = 3.720 = 2160

b) 7!-5! = 5040 - 120 = 4920

c) (3!+2!) / 5! = (6+2) / 120 = 8 / 120 = 1/15

d) 7!/8! = 7!/8.7! = 1/8

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

f) A6,4 = 6! / (6-4)! = 6! / 2! = 720/2 = 360

g) P9 = 9! = 362880