1. 1st divide to half take the heavier out / `3 s) e* c- k; |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 X, n3 s' D! v8 a# j, d公仔箱論壇3. Same method if is not equal on 2nd try.