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Advent calendar 2017

17 December

Arrange the digits 1-9 in a 3×3 square so that every row makes a three-digit square number, the first column makes a multiple of 7 and the second column makes a multiple of 4. The number in the third column is today's number.
square
square
square
multiple of 7multiple of 4today's number
Tags: numbers, grids

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