单项选择题
A.5.65% B.6.15% C.6.22% D.6.89%
A.P(A-B)=P(A)-P(B) B.P(A-B)=P(A)-P(B)+P(AB) C.P(A-B)=P(A)-P(AB) D.P(A-B)=P(A)+P(AB)