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comment How to come up with this recurrence relation for putting p rooks in a m×n chessboard?
The two disconnected parts behave just like a 2 times 2 square as far as the rules of this task are concerned. So, while it isn't a rectangle you can treat it like it were one.
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answered How to come up with this recurrence relation for putting p rooks in a m×n chessboard?
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