Question

ajutatima va rog din suflet

Answer 1

(x+1)! /(x+1-y-1)! × (x-y)!=156 × (x-1)!
(x+1)! /(x-y)! × (x-y)!=156 × (x-1)!
(x+1)! =156 × (x-1)!
(x+1)×x×(x-1)×....×1=156 × (x-1)×(x-2)×...1
(x+1)×x=156
x²+x-156=0
(x-12)(x+13)=0
x=12
x=-13