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rooks chessboard problem

17 rooks on a Chessboard

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17 rooks are placed on an 8 times 8 chessboard. Prove that there are at least 3 rooks that do not threaten each other.
17 rooks on a Chessboard
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17 rooks on a Chessboard
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17 rooks on a Chessboard
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17 rooks on a Chessboard
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17 rooks on a Chessboard
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17 rooks on a Chessboard
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17 rooks on a Chessboard
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