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$X$ and $Y$ are two random independent events. It is known that $P(X)=0.40$ and $P(X \cup Y^C)=0.7$. Which one of the following is the value of $P(X \cup Y)$?

  1. $0.7$
  2. $0.5$
  3. $0.4$
  4. $0.3$
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