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AMC 12 2022b Problem 17

  • Paper

How many 4×44 \times 4 arrays whose entries are 00s and 11s are there such that the row sums (the sum of the entries in each row) are 1,2,3,1, 2, 3, and 4,4, in some order, and the column sums (the sum of the entries in each column) are also 1,2,3,1, 2, 3, and 4,4, in some order? For example, the array [1110011011110100]\left[ \begin{array}{cccc} 1 & 1 & 1 & 0 \\ 0 & 1 & 1 & 0 \\ 1 & 1 & 1 & 1 \\ 0 & 1 & 0 & 0 \\ \end{array} \right] satisfies the condition.

(A) 144(B) 240(C) 336(D) 576(E) 624\textbf{(A) }144 \textbf{(B) }240 \textbf{(C) }336 \textbf{(D) }576 \textbf{(E) }624

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

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D

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