1. 1st divide to half take the heavier out # {2 s. U" B% Utvb now,tvbnow,bttvb2. 2nd take 4 balls out of 5 divide 2 groups to get the heavier out. (if is equal thn the remain is the one u looking for) 1 o' C( ?0 M U3 b公仔箱論壇3. Same method if is not equal on 2nd try.