But what's the probability of each of these combinations? Well, what's the probability of heads? That's 0.5 times 0.5 times 0.5 times 0.5. And then the probability of tails, since it's a fair coin, is also 0.5, times 0.5 times 0.5. So each of these, there's a 1 half chance of getting a heads times a 1 half chance of a tails times a 1 half chance of a heads times a 1 half chance of a tails, et cetera, et cetera. So each of these are essentially 1 half times 1 half, 6 times. So the probability of each of the combinations is 1 half to the 6th power.