combinatorics - How to come up with this recurrence relation for putting p rooks in a m×n chessboard? - Mathematics Stack Exchange

I have a m×n chessboard and I have to put p rooks in the board so that no two of them are in attacking position. (Two rooks attack each other if they are in the same row or same column) How many wa

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In how many ways can you arrange eight queens on a standard chessboard in such a way that none of them is attacking any other? - Quora

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