So there's a 5 8's chance that I pick a fair coin. And then there is a 3, 1, 2, 3 out of 8 chance that I pick an unfair coin. So if I were to just tell you what's the probability of picking a fair coin, you'd say, oh, 5 8's. What's the probability of an unfair coin? 3 8's. And you could convert that to a decimal or a percentage or whatever you'd like. Now, given that I have picked a fair coin, what is the probability that I will get heads twice?