Question

Помогите решить
(m+17)!=420(m+15)!

Answer 1

(m + 17)! = 420(m + 15)! 

(m + 15)! * (m + 16) * (m + 17) = 420(m +15)! 

(m + 16) * (m + 17) = 420 

m = 4