17 rooks on a Chessboard

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

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How many rooks can be placed on a chessboard so that no two rooks

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*Educational purposes: By playing chess, you can enhance your thinking logic ability, develop tactical strategy ability, improve intelligence, and

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