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\textbf{Events D and E are independent, with P(D) = 0.6 and P(D and E) = 0.18. Which of the following is true?} 
Overseas Competition->Knowledge Point->Calculation Modules
\textbf{Since D and E are independent, P(D ∩ E) = P(D)*P(E). So P(E) = 0.3.}  \textbf{P(D ∪ E) = P(D) + P(E) -- P(D ∩ E) = 0.6 +0.3 -0.18 = 0.72} 