## Solution :

We know that,

P(A/B) = \(P(A \cap B)\over P(B)\) …….(i)

and P(B/A) = \(P(B \cap A)\over P(A)\) ……….(ii)

\(\therefore\) P(B) = \(P(B/A).P(A)\over P(A/B)\) = \(1\over 3\)

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