Question

设A,B,C是随机事件,A,C互不相容,P(AB)=1/2,P(C)=1/3,求P(ABC)

Answer 1

P(AB-C)

=(P(AB)-P(ABC)) ---->A,C不相容,P(AC)=0 P(ABC) =0

=P(AB)

=1/2