Now let's look at the probability of B given A. Probability of B given A. So assuming that we've picked a blue garment, so assuming we've picked a blue garment, so it's either that one, that one, or that one, what's the probability that we have also chosen a shirt? Well, there's one, two, three possibilities, equally likely possibilities where we have a blue garment, and only one of those involves a shirt. So probability of B given A is one-third. And then finally, we could think about probability of A and B. So the probability of A and B. So this is the probability of picking a blue shirt.