So for example, it could be heads, tails, heads, tails, heads, heads. It could be, I don't know, it could be the first 4 heads, heads, heads, heads, heads, tails, tails. Right, and there are a bunch of these, and we, once again, will use the binomial coefficient, or we'll use our knowledge of combinations to figure out how many different combinations there are. 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.