So we see that for this particular event, the probability is three eight. Now, what about two boys? Well, this is the same thing as saying two are boys and one is a girl. And we know from part D that this is equal to also one eight plus one 8th plus one eight or three eighths. So to find the final probability, we simply add up these individual probabilities of these three mutually exclusive events. So we have one eight plus three eight plus three eighths.