So this is the probability for these. So let's box these in and let's look at e. So they produce at most two boys. And this is basically the key word. So what exactly do we mean by at most two boys? Well, what this means is we actually have to look at three different cases. So at most means we can have no boys or we can have one boy or we can have two boys, but we cannot have three boys because we want at most two boys.