And we have a four and a four. And it's impossible to have a five and a five because the four-sided die only goes up to four. So there's four possibilities, four of the 24 equally likely possibilities involve rolling doubles. So there's a 424th probability, or if we divide the numerator and denominator by four, it is a 1 6th probability that Erica, a 1 6th probability that Erica rolls doubles. What is probability of B? The probability that the four-sided die is a four. So the probability of B, well, once again, there's 24 equally likely possibilities.