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 I can put n rooks in a k*k chess board so that none of them are in attacking position with one another? - Quora

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