So what number of those possibilities meet our constraints? And remember, our constraint is selecting a non-blue marble from the bag. Another way to think about it is a red or a green marble, because the only non-blue ones, the only other two colors we have are red and green. So how many non-blue marbles are there? Well, there's a couple of ways to think about it. You could say there's fourteen total marbles. Two are blue, so they're going to be fourteen minus two, which is twelve non-blue marbles.