I like to keep my colors, be careful about my colors. That's 1 6th times probability of B given A. So probability of B given A is 1 4th right over here, times 1 4th, which is, curious enough, 1 24th. 1 24th. What is probability of B times probability of A given B? Well, probability of B, we figured out, is 1 4th. 1 4th.