1. 1st divide to half take the heavier out 6 C5 S7 N' r6 ?+ E2. 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) - s9 X: h1 u) V# r" r公仔箱論壇3. Same method if is not equal on 2nd try.