Question

概率论与数理统计某城市有三种报纸A,B,C该城市中有60%家庭订阅A报,40%订阅B报,30%的家庭订阅C报,又有20%

Answer 1

P=1-P(A+B+C)=1-[P(A)+P(B)+P(C)-P(AB)-P(AC)-P(BC)+P(ABC)]=1-[60%+40%+30%-20%-10%-20%+5%]=15%