设P(A)=0.7,P(B)=0.6,P(A-B)=0.3,求
(1)P(A-B)=P(A)-P(AB)所以P(AB)=P(A)-P(A-B)=0.7-0.3=0.4,P(AB)=1-P(AB) =1-0.4=0.6