The probability of Event A is 40%. The probability of Event B is 60%. The joint probability of AB is 40%. The probability (P) that A or B occurs, or both occur, is closest to:
【正确答案】
B
【答案解析】
P(A or B) = P(A) + P(B) - P(AB) = 0.40 + 0.60 - 0.40 = 0.60 or 60%.