That's 5 factorial over 3 factorial times 5 minus 3 factorial, so that's 2 factorial. That equals 5 times 4 times 3 times 2 times 1 over 3 times 2 times 1 times 2 times 1. We can ignore all the 1's. Let's see, we get 3 times 2 times 1, 3 times 2 times 1, we can cancel that. This 1 we can ignore. And then this 2, and then this turns into 2. So there are 10 possible combinations.