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AIME 2025 I / The 27 cells of a 3×9 grid are filled in using the numbers 1 through 9 so…
Problem
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question
The 27 cells of a grid are filled in using the numbers 1 through 9 so that each row contains 9 different numbers, and each of the three blocks heavily outlined in the example below contains 9 different numbers, as in the first three rows of a Sudoku puzzle.
| 4 | 2 | 8 | 9 | 6 | 3 | 1 | 7 | 5 |
| 3 | 7 | 9 | 5 | 2 | 1 | 6 | 8 | 4 |
| 5 | 6 | 1 | 8 | 4 | 7 | 9 | 2 | 3 |
The number of different ways to fill such a grid can be written as , where and are distinct prime numbers and and are positive integers. Find .
Plain-text mathematical notation (without MathML)
The 27 cells of a 3×9 grid are filled in using the numbers 1 through 9 so that each row contains 9 different numbers, and each of the three 3×3 blocks heavily outlined in the example below contains 9 different numbers, as in the first three rows of a Sudoku puzzle. | 4 | 2 | 8 | 9 | 6 | 3 | 1 | 7 | 5 | | 3 | 7 | 9 | 5 | 2 | 1 | 6 | 8 | 4 | | 5 | 6 | 1 | 8 | 4 | 7 | 9 | 2 | 3 | The number of different ways to fill such a grid can be written as p^(a)⋅q^(b)⋅r^(c)⋅s^(d), where p,q,r, and s are distinct prime numbers and a,b,c, and d are positive integers. Find p⋅a+q⋅b+r⋅c+s⋅d.
Original LaTeX notation
The 27 cells of a $3\times9$ grid are filled in using the numbers 1 through 9 so that each row contains 9 different numbers, and each of the three $3\times3$ blocks heavily outlined in the example below contains 9 different numbers, as in the first three rows of a Sudoku puzzle. | 4 | 2 | 8 | 9 | 6 | 3 | 1 | 7 | 5 | | 3 | 7 | 9 | 5 | 2 | 1 | 6 | 8 | 4 | | 5 | 6 | 1 | 8 | 4 | 7 | 9 | 2 | 3 | The number of different ways to fill such a grid can be written as $p^a\cdot q^b\cdot r^c\cdot s^d$, where $p,q,r,$ and $s$ are distinct prime numbers and $a,b,c,$ and $d$ are positive integers. Find $p\cdot a+q\cdot b+r\cdot c+s\cdot d$.
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