Question

Calcule (n+1)!/(n+2)! = 1/20

Answer 1

(n + 1)!/(n + 2)! = 1/20

(n + 1)!/(n + 2)(n + 1)! = 1/20

1/(n + 2) = 1/20

n + 2 = 20
n = 20 - 2
n = 18

R.: n = 18

Answer 2

Ola Erica

(n + 1)!/(n + 2)! = 1/20

(n + 1)!/(n + 2)*(n + 1)! = 1/20 

1/(n + 2) = 1/20

n + 2 = 20

n = 18