Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group.' I2 m# V0 B4 z, H- h; S% L
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. 5 S2 I9 C; K% J# V4 N6 H