P(A) + P(B) b. Intersection of A and B c. P(A) + P(B) - P(Aequation image indicatorB) d. Union of A and B 1. Event A or B occurs a 2. Event A and B occurs a 3. Probability P(A or B) given A and B are independent. a 4. Probability P(A and B) given A and B are dependent.