P(A|B) = P(A&B)/P(B) So first we have to find P(A&B) P(AUB) = P(A) + P(B) - P(A&B) 3/4 = 3/5 + 2/3 - P(A&B) Multiply through by 60 45 = 36 + 40 - 60P(A&B) 45 = 76 - 60P(A&B) -31 = -60P(A&B) 31/60 = P(A&B) Go back to P(A|B) = P(A&B)/P(B) P(A|B) = (31/60)/(2/3) P(A|B) = (31/60)(3/2) P(A|B) = 31/40 Edwin