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Rooks on a chessboard (Posted on 2018-11-26)

How many ways are there to place two rooks on the same column or same row on a nxn chessboard?

See The Solution Submitted by Ady TZIDON

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re: soln attempt

| Comment 2 of 4 |

(In reply to soln attempt by Steven Lord)

You've assumed the rooks are of the same colour, while actually there are 3 possibilities.

Posted by Ady TZIDON on 2018-11-26 12:27:38

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