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AMC 12 2023b Problem 8

  • Paper

How many nonempty subsets BB of {0,1,2,3,…,12}\{0, 1, 2, 3, \dots, 12\} have the property that the number of elements in BB is equal to the least element of BB? For example, B={4,6,8,11}B = \{4, 6, 8, 11\} satisfies the condition.

\textbf{(A)}\ 256 \textbf{(B)}\ 136 \textbf{(C)}\ 108 \textbf{(D)}\ 144 \textbf{(E)}\ 156

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

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D

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