I'm choosing one of them to be heads. So that over 32. And you could verify that five factorial over one factorial times five minus, actually let me just do it just so that you don't have to take my word for it. So five choose one is equal to five factorial over one factorial, which is just one, times five minus four, sorry five minus one factorial, which is equal to five factorial over four factorial, which is just going to be equal to five. All right, we're making good progress. So now let in purple, let's think about the probability that our random variable X is equal to two. Well this is going to be equal to, and now I'll actually resort to the combinatorics.