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If two events A and B are such that `P(A')=0.3,P(B)=0.4and P(AnnB')=0.5,` then find the value of `P[B//AnnB')].`

A

`1/2`

B

`1/3`

C

`1/4`

D

`1/5`

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The correct Answer is:
C
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