Let $A$ and $B$ be two events such that $P(A) = 0.3$ and $P(A \cup B) = 0.8$. If $A$ and $B$ are independent events,then $P(B) = $
- A$\frac{5}{6}$
- B$\frac{5}{7}$
- C$\frac{3}{5}$
- D$\frac{2}{5}$
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