单项选择题
A.3.5 B.3 C.4 D.1
A.39.74% B.7.61% C.7.89% D.15.79%
A.P(C) ≤P(A)+P(B)-1 B.P(C)P(A)+P(B)-1 C.P(C)=P(AB) D.P(C)=P(A∪B)