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AMC 12 2022a Problem 24

  • Paper

How many strings of length 55 formed from the digits 00, 11, 22, 33, 44 are there such that for each j∈{1,2,3,4}j \in \{1,2,3,4\}, at least jj of the digits are less than jj? (For example, 0221402214 satisfies this condition because it contains at least 11 digit less than 11, at least 22 digits less than 22, at least 33 digits less than 33, and at least 44 digits less than 44. The string 2340423404 does not satisfy the condition because it does not contain at least 22 digits less than 22.)

(A) 500(B) 625(C) 1089(D) 1199(E) 1296\textbf{(A) }500 \textbf{(B) }625 \textbf{(C) }1089 \textbf{(D) }1199 \textbf{(E) }1296

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

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E

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