1. 1st divide to half take the heavier out公仔箱論壇2 W/ Q! U9 ], s% \; J% i! F8 W
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)tvb now,tvbnow,bttvb# T! x5 o; T$ X1 `& O7 u: g2 Y0 M
3. Same method if is not equal on 2nd try.