Question

概率论：P(A)=0.5 P(B)=0.6 P(B|A)=0.8 求P(A逆B逆)

Answer 1

P(AB)=P(A)P(B︱A)=0.5×0.8=0.4

P(A∪B)=P(A)+P(B)-P(AB)=0.5+0.6-0.4=0.7

P(A逆B逆)=1-P(A∪B)=1-0.7=0.3