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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?

 Submitted by Ady TZIDON No Rating Solution: (Hide) 2 white rooks n^3-n^2 ways 2 black rooks n^3-n^2 ways 1 white and 1 black rooks 2* (n^3-n^2 ) nways answer:2* (n^3-n^2 ) nways

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 Subject Author Date correcting a typo in puzle's solution Ady TZIDON 2018-11-30 09:37:45 re(2): soln attempt Steven Lord 2018-11-26 23:46:27 re: soln attempt Ady TZIDON 2018-11-26 12:27:38 soln attempt Steven Lord 2018-11-26 09:50:32
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