Question

已知P(A)=0.4,P(B)=0.25,P(A-B)=0.25,求P(AB的非)

Answer 1

P(A-B) = P(A) -P(A∩B)

0.25=0.4-P(A∩B)

P(A∩B) =0.15

P(~(A∩B))

=1-P(A∩B)

=1-0.15

=0.85