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AMC 12 2025a Problem 13

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Let C={1,2,3,…,13}C = \{1, 2, 3, \dots, 13\}. Let NN be the greatest integer such that there exists a subset of CC with NN elements that does not contain five consecutive integers. Suppose NN integers are chosen at random from CC without replacement. What is the probability that the chosen elements do not include five consecutive integers?

\textbf{(A)}\frac{3}{130} \textbf{(B)}\frac{3}{143} \textbf{(C)}\frac{5}{143} \textbf{(D)}\frac{1}{26} \textbf{(E)}~\frac{5}{78}

Dataset text AMC 12 2000 to 2025. Quoted with source.

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