Question

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

n!=?

Answer 1

first of all what is (n+1)!

Answer 2

@mitchelsewbaran please reply to my question

Answer 3

idk. this is why i'm asing the question to c if any one knows

Answer 4

(n+1)! = 1*2*3*4*..*n-1*n*n+1