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2018 AMC 10B Problems/Problem 5

Revision as of 14:13, 16 February 2018 by Cardinals2014 (talk | contribs) (Created page with "How many subsets of <math>\{2,3,4,5,6,7,8,9\}</math> contain at least one prime number? <math>\textbf{(A)} \text{ 128} \qquad \textbf{(B)} \text{ 192} \qquad \textbf{(C)} \te...")
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How many subsets of $\{2,3,4,5,6,7,8,9\}$ contain at least one prime number?

$\textbf{(A)} \text{ 128} \qquad \textbf{(B)} \text{ 192} \qquad \textbf{(C)} \text{ 224} \qquad \textbf{(D)} \text{ 240} \qquad \textbf{(E)} \text{ 256}$

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