Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. 9 B- Y# }1 Y: t* oThe 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.公仔箱論壇; x/ [0 [% V1 |5 _% k$ {& B6 K