Associated to a random experiment two events \( A \) and \( B \) are such that \( P(B)=3 / 5 \),...

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Associated to a random experiment two events \( A \) and \( B \) are such that \( P(B)=3 / 5 \), \( P(A / B)=1 / 2 \) and \( P(A \cup B)=4 / 5 \). The value of \( P(A) \) is
(A) \( \frac{3}{10} \)
(B) \( \frac{1}{2} \)
(C) \( \frac{1}{10} \)
(D) \( \frac{3}{5} \)
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