1. 1st divide to half take the heavier out % b5 d& o% K- o! D% {公仔箱論壇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) 7 r' g& q/ D: Q& M1 J1 L( N. Otvb now,tvbnow,bttvb3. Same method if is not equal on 2nd try.