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HMMT 2002 F1

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The squares of a chessboard are numbered from left to right and top to bottom (so that the first row reads 1,2,…,81,2, \ldots, 8, the second reads 9,10,…,169,10, \ldots, 16, and so forth). The number 1 is on a black square. How many black squares contain odd numbers?

Dataset text NuminaMath olympiads. Quoted with source.

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16

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