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AMC 10 2022a Problem 17

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How many three-digit positive integers a‾ b‾ c‾\underline{a} \ \underline{b} \ \underline{c} are there whose nonzero digits a,b,a,b, and cc satisfy 0.a‾ b‾ c‾‾=13(0.a‾+0.b‾+0.c‾)?0.\overline{\underline{a}~\underline{b}~\underline{c}} = \frac{1}{3} (0.\overline{a} + 0.\overline{b} + 0.\overline{c})? (The bar indicates repetition, thus 0.a‾ b‾ c‾‾0.\overline{\underline{a}~\underline{b}~\underline{c}} is the infinite repeating decimal 0.a‾ b‾ c‾ a‾ b‾ c‾ ⋯0.\underline{a}~\underline{b}~\underline{c}~\underline{a}~\underline{b}~\underline{c}~\cdots) (A) 9(B) 10(C) 11(D) 13(E) 14\textbf{(A) } 9 \textbf{(B) } 10 \textbf{(C) } 11 \textbf{(D) } 13 \textbf{(E) } 14

Dataset text NuminaMath-1.5. Quoted with source.

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13

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