1. 1st divide to half take the heavier out公仔箱論壇0 p/ [; O5 U4 D2 m5 S
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) ; q/ `' M5 Q) B3 |+ }3. Same method if is not equal on 2nd try.