Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group.
+ Q2 R( U" ~8 t/ dThe 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.
1 ^! G7 c: g2 `5 B- ] |