\( A \) and \( B \) are events such that \( \mathrm{P}(\mathrm{A})=...

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\( A \) and \( B \) are events such that \( \mathrm{P}(\mathrm{A})=0.4, \mathrm{P}(\mathrm{B})=0.3 \) and \( \mathrm{P}(\mathrm{A} \cup \mathrm{B})=0.5 \). Then \( P\left(B^{\prime} \cap A\right) \) equals
\( \mathrm{P} \)
(A) \( \frac{2}{3} \)
(B) \( \frac{1}{2} \)
(C) \( \frac{3}{10} \)
(D) \( \frac{1}{5} \)
W)
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