But if I have eight flips, there's 56 ways of picking three of those flips to be heads. So let's go to our original probability problem. What is the probability that I get three out of eight heads? Well, it's the probability, it's the number of ways I can pick three out of those eight, so it equals 56, over the total number of outcomes, right? The total number of outcomes is 2 to the 8th. Another way I could write that, 56, let me unseparate, that's 8 times 7 over 2 to the 8th. 8 is 2 to the 3rd, right?