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3 points colinear? No way! (Posted on 2005-05-19) Difficulty: 5 of 5
For any grid, x by x, figure out a formula for the greatest number of points that can be put on the inside of the grid such that no three points are colinear.

No Solution Yet Submitted by Corey    
Rating: 3.0000 (1 votes)

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re(2): Theoretical limits reachable? | Comment 3 of 14 |
(In reply to re: Theoretical limits reachable? by Justin)

You can't put an X in the middle of the 7x7 because colinear does not limit lines to horizontal, vertical and major diagonals.  There are many other diagonals which would be affected by an X in the middle.
  Posted by Erik O. on 2005-05-19 19:12:49

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