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AMC 12 2019a Problem 16

  • Paper

The numbers 1,2,…,91,2,\dots,9 are randomly placed into the 99 squares of a 3×33 \times 3 grid. Each square gets one number, and each of the numbers is used once. What is the probability that the sum of the numbers in each row and each column is odd?

(A) 121(B) 114(C) 563(D) 221(E) 17\textbf{(A) }\frac{1}{21} \textbf{(B) }\frac{1}{14} \textbf{(C) }\frac{5}{63} \textbf{(D) }\frac{2}{21} \textbf{(E) } \frac17

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

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