So five choose four is equal to five factorial over four factorial times five minus four factorial, which is equal to, well that's just going to be five factorial. This is going to be one factorial right over here. So that doesn't change the value. You're just going to multiply one factorial times four factorial. So it's five factorial over four factorial, which is equal to five. So once again, this is five 32nds. And you could have reasoned through this, because if you're saying you want five heads, that means you have one tail.