如题所述
解çï¼
æ¬é¢ä¸å®¹æ¥åç类似
P(AC)=0
åP(ABC)=0
设A,B,Cä¸è³å°æä¸ä¸ªåç 为äºä»¶D
P(D)=P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)
=(1/4)*3-1/16-0-1/16+0
=5/8
æ¬é¢ä¸å®¹æ¥åç类似
P(AC)=0
åP(ABC)=0
设A,B,Cä¸è³å°æä¸ä¸ªåç 为äºä»¶D
P(D)=P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)
=(1/4)*3-1/16-0-1/16+0
=5/8
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