1. 1st divide to half take the heavier out公仔箱論壇3 _& z) Z" n) q$ s# I
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) 8 G8 _3 |9 `$ h0 f公仔箱論壇3. Same method if is not equal on 2nd try.