Or another way of thinking about it is, how many ways are there to, from a pool of six items, people in this example, how many ways are there to choose four of them? And that is going to be, you know, we could do it, you know, well, I'll apply the formula first, and then I'll reason through it. And like I always say, I don't, I'm not a huge fan of the formula. Every time I, you know, I revisit it after a few years, I actually just rethink about it as opposed to memorizing it, because memorizing is a good way to not understand what's actually going on. But if we just applied the formula here, but I really want you to understand what's happening with the formula, it would be six factorial over four factorial, over four factorial, times six minus four factorial. Six, whoops, let me actually, let me just, so this is six minus four factorial, so this part right over here, six minus four, actually, let me write it out, because I know this can be a little bit confusing the first time you see it. So six minus four factorial, factorial, which is equal to, which is equal to six factorial over four factorial, over four factorial, times, this thing right over here is two factorial, times two factorial, which is going to be equal to, we could just write out the factorial, six times five times four times three times two times one, over four, four times three times two times one, times, times two times one, and of course, that's going to cancel with that, and then the one really doesn't change the value, so let me get rid of this one here, and then let's see, this three can cancel with this three, this four could cancel with this four, and then it's six divided by two is going to be three, and so we are just left with three times five, so we are left with, we are left with, there's 15 combinations.