1. 1st divide to half take the heavier out公仔箱論壇4 w) ~, b) U& P7 J% C! a
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)5 }* P# a$ ~# R7 q/ R0 H6 M
3. Same method if is not equal on 2nd try.