第1个回答 2017-09-08
P(A)=C(48,13)/C(52,13)=30.38%
P(B)=C(4,1)C(48,12)/C(52,13)=43.88%
P(B|A)=C(48,13)C(4,1)C(35,12)/C(52,13)C(39,13)=12.48%
P(A|B)=C(4,1)C(48,12)C(36,13)/C(52,13)C(39,13)=12.48%
P(A交B)=P(B|A)=12.48%
P(A并B)=P(A)+P(B)-P(A交B)=30.38%+43.88%-12.48%=61.78%