We know that the probability of A and B is the product of these two things. That's going to be 0.35. Seven times five is 35, or I guess you could say half of 0.7 is 0.35, 0.5 of 0.7. That is going to be equal to what we need to figure out, the probability of B given A times the probability of A. But we know the probability of A. We know that that is 0.6. We know that this is 0.6.