Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. , p: n- X- e* J: K5 F& _4 S6 i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.$ W* t% k. H& }9 |9 H5 S