1. 1st divide to half take the heavier out公仔箱論壇4 z" J. m* j+ v0 d# T
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)4 a6 @/ q: K7 k$ h8 ]* R. ]7 T
3. Same method if is not equal on 2nd try.