1. 1st divide to half take the heavier out% @# M3 c+ t& Z, [& d# r8 u6 ^
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)公仔箱論壇7 a& F$ w6 |0 I' {6 Z
3. Same method if is not equal on 2nd try.