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- Apr 23rd 2013, 11:32 AManimalmanny[probability] any help with this challenging problem?? explanations appreciated
- Apr 23rd 2013, 01:47 PMHallsofIvyRe: [probability] any help with this challenging problem?? explanations appreciated
In any two by two sub-grid, there are $\displaystyle 4^4= 64$ equally likely "configuration". Only one such configuration gives a circle.

- Apr 23rd 2013, 09:05 PManimalmannyRe: [probability] any help with this challenging problem?? explanations appreciated
i got it, thanks for your help.