Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. & @6 Y" n2 d, q* ^9 p' {& QThe 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. / h' f5 N* S6 F- D, ]公仔箱論壇