8.已知 (A)=dfrac (1)(4) ,(B|A)=dfrac (1)(3) ,(B)=dfrac (1)(6) ,则-|||-P(A|B)=-|||-A dfrac (1)(12) .-|||-B dfrac (1)(2)-|||-C dfrac (1)(3).-|||-D dfrac (1)(4)

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