And here we get a girl and a girl. Now, the probabilities of these individual events taking place because they're independent, we have to use the product pool, as we use is here and here. And so we have one fourth here, one fourth here, one fourth here, and one fourth here. This is exactly the same as in this case. So first we applied the product rule and now we have to apply the sum rule. So what we want is one girl and one boy.