Now if I pick a fair coin, given that I have a fair coin, what is the probability given the fair coin, what is the probability that I get 4 out of 6 heads? Well once again, let's think about the previous several videos. What's the probability of getting any one particular combination of 4 out of 6 heads? 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?