And it turns out that I got 5 out of, well, let's say, yeah. Well, let's say I got 4 out of 6 heads. That's the result I got. What I want to know is, what is the probability that I picked out a fair coin given that I got 4 out of 6 heads? So before moving on, let's do a little bit of a review of Bayes' theorem. And I think that'll give us a good framework for the rest of this problem. So Bayes' theorem, and let me do it in this corner up here.