What is the probability of getting two heads? So we could get it through this method, by chance picking the fair coin, or through this method, by chance picking the unfair coin. So since we can do it either way, we can sum up the probabilities. Either of these events meet our constraints. So we can just add these two things up. So let's do that. So we can add 0.135 plus 0.15625 gives us 0.29125.