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

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