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If A and b are any two events such that ...

If A and b are any two events such that `P(A)+P(B)-P(A "and"B)=P(A)`, then

A

`P(B//A)=1`

B

`P(A//B)=1`

C

`P(B//A)=0`

D

`P(A//B)=0`

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