Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group.9 h; _' F+ x! j' R: a
The problem is we don't know the weight of each individual ball, so it will not be accurate to figure out which ball is irregular by only weight them once. 4 {; z; k5 x# p% E