Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. ' z+ q ~: T$ O W# i1 Q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.3 {7 M% m# \) _- R