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How many rooks can be placed on a chessboard so that no two rooks are attacking each other? - Quora

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You are given an 8×8 chessboard. If two distinct squares are chosen uniformly at random What is the probability that two rooks placed on these squares attack each other? - Quora

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In how many ways can one place 4 rooks on a chessboard so that they do not threaten each other? - Quora