Imagine a 3 dimensional grid with N x N x N points.
Place as many points as possible on this grid, such that there are no 3 points in a line (for N = 2, this is of course 8).
How much is it for N = 3, 4 or 5?

3x3=9 x3=27

4x4=16 x4=64

5x5=25 x5=125

Posted by fiona on 2005-07-11 14:14:47