AMC 10 Step by Step
2024 AMC 10AProblem 21P21-25~7 minPrint

The numbers, in order, of each row and the numbers, in order, of each column of a 5×55 \times 5 array of integers form an arithmetic progression of length 55 . The numbers in positions (5,5)(5, 5) , (2,4)(2, 4) , (4,3)(4, 3) and (3,1)(3, 1) are 00 , 4848 , 1616 , and 1212 , respectively. What number is in position (1,2)(1, 2) ? [.?......48.12......16......0]\begin{bmatrix} . & ? &.&.&. \\ .&.&.&48&.\\ 12&.&.&.&.\\ .&.&16&.&.\\ .&.&.&.&0\end{bmatrix}

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.