(1)设A,B,C是三个事件,且 (A)=P(B)=P(C)=dfrac (1)(4), P(AB)=-|||-(BC)=0, (AC)=dfrac (1)(8), 求A,B,C至少有一个发生的概率.-|||-(2)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, AB; cup Bcup C, ABC,ABC, overrightarrow (AB)cup C 的-|||-概率.-|||-(3)已知 (A)=dfrac (1)(2), (i)若A,B互不相容,求P(AB),(ii )若 (AB)=dfrac (1)(8),-|||-求P(AB).