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 - How many ways are there to get from one point to another on a (simple) chessboard? - Mathematics Stack Exchange

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