And the case that we want to look at is this square right here. So we have only one of these four squares, satisfies condition B, where we have a male and that male is actually color blind. And so we have a one fourth chance, which is equivalent to zero point 25, which is equivalent to fifth or 25%. Let's move on to C. So if the child is a female, so we begin Part C by assuming that the child is in fact a female. The question is, knowing that the child is a female, what is the probability that she is normal? So now, because we know that the child is female, the only thing we want to look at is this square.