数学试题讲解

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已知

P (A) = \frac{1}{5}, P (B ∣ A) = \frac{1}{2}, P (\bar{B} ∣ \bar{A}) = \frac{5}{8}

, 则

P (B) =

\frac{2}{5}

\frac{1}{6}

\frac{1}{5}

\frac{3}{8}