设事件A,B,C两两独立,满足ABC=,P(A)=P(B)=P(C),且P(A+B+C)=则P(A)=_______.
由P(A+B+C)=P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)且ABC=,P(A)=P(B)=P(C),得
设事件A,B,C两两独立,满足ABC=,P(A)=P(B)=P(C),且P(A+B+C)=
设事件A,B,C两两独立,满足ABC=,P(A)=P(B)=P(C),且P(A+B+C)=则P(A)=_______.
由P(A+B+C)=P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)且ABC=,P(A)=P(B)=P(C),得