1.4.9medium一级题目发布者: ai-batch题干已知 P(Aˉ)=0.3P(\bar{A})=0.3P(Aˉ)=0.3，P(B)=0.4P(B)=0.4P(B)=0.4，P(ABˉ)=0.5P(A\bar{B})=0.5P(ABˉ)=0.5，求 P(B∣A∪Bˉ)P(B \mid A \cup \bar{B})P(B∣A∪Bˉ)。