Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. 4 p! o) `2 O+ P) g r aThe 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. % V4 [# B& I' r- Y! A