如题所述
A+B=0.7,
(A+0.15)*0.3=0.15,
A=0.35,
B=0.35.追问
(A+0.15)*0.3=0.15,
A=0.35,
B=0.35.追问
请问第二个式子是怎么来的呀?
追答根据独立性,
P(X=1,Y=3)=
P(X=1)*P(Y=3),
P(X=1)=P(1,3)+P(1,4)=A+0.5,
P(Y=3)=P(1,3)+P(2,3),
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