So the probability of B, well, once again, there's 24 equally likely possibilities. And how many of them involve the four-sided die being a four? Well, you have all of these right over here involve a four-sided die being a four. So this is one, two, three, four, five, six of the 24 equally likely possibilities. Or you could say 1 4th of the equally likely possibilities, or the probability is 1 4th, which makes sense because probability of B, it kind of ignores the six-sided die. And it just says, well, what's the probability that the four-sided die is four? Well, that's one out of the four possible outcomes for that four-sided die.