--科数网kmath.cn

1. （单选题）设

A 、 B 、 C

为随机事件,

P (A) = P (B) = P (C) = \frac{1}{4}

P (A B) = P (B C) = P (A C) = \frac{1}{6}, P (A \cup B \cup C) = \frac{3}{8}

, 则

P (C ∣ A B) =

A、

\frac{1}{16}

B、

\frac{1}{4}

C、

\frac{1}{2}

D、

\frac{2}{3}