1. 1st divide to half take the heavier out 5 C! k, y2 N. E8 a2 W' ^9 ^tvb 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)公仔箱論壇* A2 ` ?4 e- u4 x( j( w
3. Same method if is not equal on 2nd try.