1. 1st divide to half take the heavier out & S) N" r+ S) ~4 I% E) b2. 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) ; m1 k1 P2 I2 k- n2 ~公仔箱論壇3. Same method if is not equal on 2nd try.