Let \( A \) and \( B \) are events of an experiment and \( P(A)=1 / 4 \), \( P(A \cup B)=1 / 2 \...
Let \( A \) and \( B \) are events of an experiment and \( P(A)=1 / 4 \), \( P(A \cup B)=1 / 2 \), then value of \( P\left(B / A^{c}\right) \) is
(A) \( 2 / 3 \)
(B) \( 1 / 3 \)
(C) \( 5 / 6 \)
(D) \( 1 / 2 \)
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