1. 1st divide to half take the heavier out ! z$ s9 R D7 f) Xtvb now,tvbnow,bttvb2. 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) 1 ^) g8 Y4 Z1 F. K g- ]8 F. ?5 \公仔箱論壇3. Same method if is not equal on 2nd try.