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Rook Placement (Posted on 2015-09-21) Difficulty: 3 of 5
We place 41 rooks on a 10 x 10 chessboard. Prove that one can choose five of them that do not attack each other.

*** Two rooks "attack" each other if they are in the same row or column of the chessboard.

Source: A problem appearing in Colorado Mathematical Olympiad.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
Some Thoughtsre(2): the “official” solution - spoilerAdy TZIDON2015-09-27 06:41:47
re: the “official” solution - spoilerSteve Herman2015-09-27 06:39:20
Solutionthe “official” solution - spoilerAdy TZIDON2015-09-26 16:45:00
re: Detailed solution (SPOILER)Charlie2015-09-26 07:51:35
SolutionDetailed solution (SPOILER)Ady TZIDON2015-09-26 06:10:45
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