Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group. 5 a1 M4 F) N: ^ o9 y5.39.217.77:8898The 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.- ` f0 N6 ]( W2 F$ s) j9 ]( ?