If two events \( A \) and \( B \) are such that \( P\left(A^{C}\right)=0.3, P(B)= \) \( 0.4 \) a...

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If two events \( A \) and \( B \) are such that \( P\left(A^{C}\right)=0.3, P(B)= \) \( 0.4 \) and \( P\left(A \cap B^{C}\right)=0.5 \) then \( P\left[B /\left(A \cup B^{C}\right)\right] \) is equal to
(A) \( \frac{1}{4} \)
(B) \( \frac{1}{2} \)
(C) \( \frac{3}{4} \)
(D) \( \frac{2}{3} \)
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