So this is the probability that X equals two. Well what's this going to be? Well I'll do it right over here, and actually no reason for me to have to keep switching colors. So five choose two is going to be equal to five factorial over two factorial times five minus two factorial. Five minus two factorial, so this is five factorial over two factorial times three factorial. And this is going to be equal to five times four times three times two. I could write times one, but that doesn't really do anything for us.