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If A and B are two events such that A!=v...

If A and B are two events such that `A!=varphi,\ B=varphi,` then a.`P(A//B)=(P(AnnB))/(P(B))` b. `P(A//B)=P(A)P(B)` c. `P(A//B)=P(B//A)=1` d. `P(A//B)=(P(A))/(P(b))`

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