jacky101mm

Well..divided into 6/6 first to define a heavier group is certainly right. Randomly select 3/3 will result another heavier group.
  h0 V" r; A, H5 n" a& P7 E5.39.217.77The 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.$ Y. ^3 H' c* W# l& a+ G2 o5 z