Let S = {1, , n}. Suppose that subsets A and B are chosen independently from S so that A and B are equally likely to be any of the 2n subsets of S (including both the empty set and S itself). What is the probability that A B? What is the probability that A B = ? Solution A: as both are equaly likely 50/100 = 0.5 b: 0/100 = 0.