Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. ' k% E k3 Z8 d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. 7 r. o' P2 E8 e3 z) }$ r公仔箱論壇