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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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  Subject Author Date
Solutioncorrecting a typo in puzle's solutionAdy TZIDON2018-11-30 09:37:45
re(2): soln attemptSteven Lord2018-11-26 23:46:27
Hints/Tipsre: soln attemptAdy TZIDON2018-11-26 12:27:38
soln attemptSteven Lord2018-11-26 09:50:32
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