Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. . w j! n' o) ?公仔箱論壇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. % _" K9 F% Z& l7 x3 a% [- I