Question

p(a的逆b)怎么算

Answer 1

根据加法原则P(A+B)=P(A)+P(B)-P(AB) 1-P(A的逆)P(B的逆)=1-(1-P(A))(1-P(B))=P(A)+P(B)-P(A)P(B)

Answer 2

P(AB)=P(A)P(B︱A)
P(A∪B)=P(A)+P(B)-P(AB)
P(A逆B逆)=1-P(A∪B)