combinatorics - Possible ways to place tower on chess board without any tower beating another - Mathematics Stack Exchange

On a regular chess board (8 by 8 possible positions) we place 8 towers. How many possibilities are there where no tower can beat another tower, i.e no more than one tower on each row and and column.

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Combinatorics problem, counting the number of ways to place kings on a chessboard with some restrictions - Mathematics Stack Exchange

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combinatorics - Number of ways to place exactly two kings in each column such that no king attacks another - Mathematics Stack Exchange

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problem solving - Chess board combinatorics - Mathematics Stack Exchange

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