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Rooks on a chessboard (Posted on 2018-11-26) Difficulty: 2 of 5
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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Hints/Tips 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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