Question

RESOLVA A EQUAÇÃO Ax,2 = Ax,3

Answer 1

x!/(x-2)! = x!(x-3)! => x!(x -2)(x -3)! = x!( x-3)!, Simplificando, fica
x - 2 = 1 = > x = 3
S = { 3 }

Answer 2

$A_{x,2}=A_{x,3}\\\\ \frac{x!}{(x-2)!}=\frac{x!}{(x-3)!}\\\\\ (x-2)!=(x-3)!\\\\ (x-2)(x-3)!=(x-3)!\\\\ x-2=1\\\\ x=1+2\\\\ \large\boxed{x=3}}$