If you don't believe me, we can actually try it out. Let's think about what 5 factorial over 5 minus 3 factorial is going to be. This is going to be 5 times 4 times 3 times 2 times 1. All of that stuff up there, all the way down to 1. 5 minus 3 is 2 over 2 factorial, 2 times 1. 2 cancels with 2, 1 cancels with 1. You don't have to worry about that.