perplexus.info :: Games : Rook Placement

Rook Placement (Posted on 2015-09-21)

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.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

re: Detailed solution (SPOILER)

| Comment 2 of 5 |

(In reply to Detailed solution (SPOILER) by Ady TZIDON)

Lots of unresolved LaTeX formulae there.

Posted by Charlie on 2015-09-26 07:51:35

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