Question

calcule o valor ou simplifique
a) 6!
b)7!/4!
c) 3!5!/ 4!6!
d)n!/(n-2)

Answer 1

a) 6.5.4.3.2 = 720

b) 7.6.5.4! / 4! = 7.6.5 = 210

c) 3! 5! / 4! 6! = 5 ! 3! / 6.5! 4.3! = 1 . 1 / 6 . 4 = 1/24

d) n! / (n - 2) = n. ( n -1 ) . ( n - 2 ) . ( n - 3 )! / ( n -2 ) = n. ( n - 1). ( n - 3 )!/ 1

*Acho que você copiou errado a D)

se for n! / ( n - 2 )!

n . ( n - 1 ) . ( n - 2 )!/ ( n - 2 )! = n . ( n - 1 )/ 1