Question

O valor de n que satisfaz a igualdade (n + 2) · (n + 1) n! = 720 é:
a) 1
b) 2
c) 3
d) 4
e) 5

Answer 1

 (n + 2) · (n + 1) n! = 720

 (n + 2) · (n + 1) n! = 6!

(n+2)!=6!

n+2=6

n=4  é a resposta

Answer 2

Boa noite Charuru


(n  + 2)*(n + 1)*n! = 720
(n + 2)! = 720
(n + 2)! = 6!

n = 4 (D)