1 4th. And the probability of A given B is 1 6th, times 1 6th, times 1 6th, which is equal to 1 24th. Now, does it make sense that the probability of A and B is 1 24th, that the probability of A times probability of B given A is 1 24th, and the probability of B times probability of A given B, they're all 1 24th. Is this always going to be the case? Well, sure. Think about what probability of A and B means. Well, it means that they both happened.