设A,B是随机事件,P(A)=0.7,P(A-B=0.3,则P(AB)=

问题描述:

设A,B是随机事件,P(A)=0.7,P(A-B=0.3,则P(AB)=

P(AB) = P(A) - P(A-B) = 0.7 - 0.3 = 0.4