Question

resolva equação fatorial
(n+3)¹!/(n+1)!=20

Answer 1

(n+3) (n+2) (n+1)!/ (n+1)! = 20

(N+3)(n+2) = 20

N^2 + 2n + 3n + 6= 20

N^2 + 5n -14=0

N = 2