Re: [math-fun] Number of ways to pick 4 points from an m X n grid?

14 Jun 2020


      I pointed Neil to https://mathworld.wolfram.com/SylvestersFour-PointProblem.html which shows the limit is 
25/36 ~ 0.694444.  Tom's result at 21x21 is 1053055398/1554599970 ~ 0.67738.

Re: [math-fun] Number of ways to pick 4 points from an m X n grid?

ed pegg