P(AB)+P(BC)=0→P(AB)=0,P(BC)=0,P(ABC)=0P(A+B+C)=P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)=1/4+1/4+1/4-1/8=5/81-P(A+B+C)=1-5/8=3/8
