Hi, I am studying for the GMAT and there is an example in one of my test prep books that does not make sense to me.

"a man has 5 shirts. If he has to bring 2 shirts, how many possible arrangements are there? Order does not matter"

The formula it says is C(5,3) 5!/(5-3)!*3!

What I can't understand is why m=3 instead of 2. If it's arrangements of 2 shirts, why isn't it C(5,2) 5!/(5-2)!*2!