link: imgur: the simple image sharer

- Apr 23rd 2013, 12:32 PManimalmanny[probability] any help with this challenging problem?? explanations appreciated
- Apr 23rd 2013, 02:47 PMHallsofIvyRe: [probability] any help with this challenging problem?? explanations appreciated
In any two by two sub-grid, there are equally likely "configuration". Only one such configuration gives a circle.

- Apr 23rd 2013, 10:05 PManimalmannyRe: [probability] any help with this challenging problem?? explanations appreciated
i got it, thanks for your help.