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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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re(2): soln attempt | Comment 3 of 4 |
(In reply to re: soln attempt by Ady TZIDON)

OK, then multiply by 4 for WB BW BB WW for each answer:

4(n^3-n^2)

Edited on November 26, 2018, 11:47 pm
  Posted by Steven Lord on 2018-11-26 23:46:27

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