1. 1st divide to half take the heavier out ) O- j* c* @* s* o, q2. 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)公仔箱論壇/ @% j; p, ^/ x1 i8 ?$ V: M& F
3. Same method if is not equal on 2nd try.