The rest are fair coins. So if three are unfair, the rest are eight coins. And when I say that, or when this problem says that they are fair coins, it means that they have a 50-50 chance of coming up either heads or tails. You randomly choose one coin from the bag and flip it two times. What is the percent probability of getting two heads? So this is an interesting question, but if we break it down, essentially with a decision tree, it'll help break it down a little bit better. So let's say that, so we have a bag.