\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} 
\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?} 
A. \textbf{P(E) = 0.12} 
B. \textbf{P(E) = 0.4} 
C. \textbf{P(D or E) = 0.28} 
D. \textbf{P(D or E) = 0.72} 
E. \textbf{P(D or E) = 0.9} 