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.
(In reply to re: Theoretical limits reachable?
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