Unlocking mist

simply guyz there is two numbers equal their factorial values which are 1,2 and so it can't be 1 answer is 2

For some values of $n$ , we have that $n!$ is:

$0! = 1 \\ 1! = 1 \\ 2! = 2 \\ 3! = 6 \\ \ldots$

So we can see that, if $x = x!$ , then $x = 1$ or $2$ . But for $x = 1, xy = y$ , with $\left ( y \neq 0 \right )$ .

But for $x = 2, xy = 2y$ , again with $\left ( y \neq 0 \right )$ .

So, the correct answer is $x = 2$ .