1. 1st divide to half take the heavier out公仔箱論壇1 s+ O$ y* P* v. L1 Z3 F1 D0 Z
2. 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) 7 I. a+ z( G7 b' O6 G/ @公仔箱論壇3. Same method if is not equal on 2nd try.