1.设A,B,C为三个事件, P(A)=P(B)=P(C)=dfrac (1)(4) P(AB)=P(AC)=Pdfrac (1)(8) P(ABC)=dfrac (1)(16) ,分别求下列概率:(1) P(Acup Bcup C);(2)P(ABC).

1.设A,B,C为三个事件, $P(A)=P(B)=P(C)=\dfrac {1}{4}$ $P(AB)=P(AC)=P$$\dfrac {1}{8}$ $P(ABC)=\dfrac {1}{16}$ ,分别求下列概率:(1) $P(A\cup B\cup C)$;(2)P(ABC).

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