X and Y are two random independent events It is known...

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

A. 0.7

B. 0.5

C. 0.4

D. 0.3

Answer: Option A

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