1. 1st divide to half take the heavier out ( q# P e: `% G: F. {6 V( C; V2. 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) * F, P5 w* ]7 \公仔箱論壇3. Same method if is not equal on 2nd try.