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If two events A and B are such that P(A') =0.3, P(B)=0.4 and $P (A \cap B^{'}) = 0.5$ , then $P (\frac{B}{A \cup B}) =$
$\frac{1}{4}$
$\frac{1}{5}$
$\frac{3}{5}$
$\frac{2}{5}$

A

\frac{1}{4}

B

\frac{1}{5}

C

\frac{2}{5}

D

\frac{3}{5}

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