题目
已知 (A)=dfrac (1)(2) , (B)=dfrac (1)(3) , (C)=dfrac (1)(5)-|||-, (AB)=dfrac (1)(10) , (AC)=dfrac (1)(15) ,-|||-(BC)=dfrac (1)(20) , (ABC)=dfrac (1)(30) ,求 cup B-|||-,overline (A)overline (B) , cup Bcup C ,ABC,ABC,-|||-overline (AB)cup C 的概率.

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