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9 balls, 10 straight lines (Posted on 2008-10-12) Difficulty: 2 of 5
Place 9 balls ("o") in the intersections of the grid below to achieve 10 straight lines, each line containing 3 and exactly 3 balls. You may assume, if you need, that each cell is a perfect square.
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+
           |   |   |   |   |   |   |   |   |
           +---+---+---+---+---+---+---+---+

See The Solution Submitted by pcbouhid    
Rating: 2.0000 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Generic answer (Spoiler) | Comment 3 of 21 |
(In reply to Generic answer (Spoiler) by Leming)

well here is an actuall implementation of Leming's solution that confirms it works

           o---+---o---+---o
           |     |    |     |    |
           +---o---o---o---+
           |     |    |    |     |
           o---+---o---+---o
       


  Posted by Daniel on 2008-10-13 17:45:10
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