(1)已知 P(overline(A))=0.3, P(B)=0.4, P(Aoverline(B))=0.5, 求条件概率 P(B|Acupoverline(B)). (2)已知 P(A)=1/4, P(B|A)=1/3, P(A|B)=1/2, 求 P(Acup B).

14. (1)已知 $P(\overline{A})=0.3$, $P(B)=0.4$, $P(A\overline{B})=0.5$, 求条件概率 $P(B|A\cup\overline{B})$. (2)已知 $P(A)=1/4$, $P(B|A)=1/3$, $P(A|B)=1/2$, 求 $P(A\cup B)$.

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