Question

Se (x+1)! =3(x!),entao X é igual a:
a) 1
b)4
c)2
d)3

Answer 1

$(x+1)! = 3.x! \\ (x+1).\not x! = 3.\not x! \\ \\ x + 1 = 3 \\ x = 3 - 1 \\ \\ \boxed{x = 2}$