1. 1st divide to half take the heavier out公仔箱論壇& P( P" [: F Y* d
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)& q U! ?$ s% A) w" C8 w5 C
3. Same method if is not equal on 2nd try.