P(C|A)=P(CA)/P(A) P(CA)=P(A)*P(C|A)
P(B|A)=P(BA)/P(A) P(AB)=P(A)*P(B|A)
P(ABC)=P(AB|C)*P(C)
P(AUBUC)=P(A)+P(B)+P(C))-P(AB)-P(BC)-P(AC)+P(ABC)=1
P(ABC)
=P(AUBUC)-{P(A)+P(B)+P(C))-P(AB)-P(BC)-P(AC)}
=1-{P(A)+P(B)+P(C)-P(AB)-P(BC)-P(AC)}
=1-[P(A)+P(B)+P(C)-P(A)*P(B|A)-P(A)*P(C|A)-P(B|C)*P(C)]
.是不是还少一个P(B|C)啊 坑爹啊~