1. The problem statement, all variables and given/known data For married couples, the probability that the husband will vote on a bond referendum is 0.21, the probability that his wife will vote in the referendum is 0.28 and the probability that both the husband and wife will vote is 0.15. What is the probability that a husband will vote, given that his wife does not vote? 2. Relevant equations If A is probability that husband votes, and B the probability that the wife votes, the probability that husband votes given that the wife does NOT should be: P(A|B')=P(A n B')/P(B') 3. The attempt at a solution But, I have absolutely no idea how I can find (A n B') from the given data... I'll be very grateful for your help.