Problem
2018 AMC 12B Problem 5
How many subsets of \{2,3,4,5,6,7,8,9\} contain at least one prime number?
\textbf{(A) } 128 \qquad \textbf{(B) } 192 \qquad \textbf{(C) } 224 \qquad \textbf{(D) } 240 \qquad \textbf{(E) } 256
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