I can give you a couple of examples. And they'll be exactly, and just so you know, they'll be exactly k terms here. 1, 2, 3, this is the first term, second term, third term, all the way, and this is the kth term. And this is important to our derivation of the Poisson distribution. But just to make this in real numbers, if I had 7 factorial over 7 minus 2 factorial, that's equal to 7 times 6 times 5 times 4 times 3 times 2 times 1 over 2 times, no sorry, 7 minus 2, this is 5. So it's over 5 times 4 times 3 times 2 times 1. These cancel out, and you just have 7 times 6.