1. 1st divide to half take the heavier out- W: ?9 T& p. a
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) % H+ y/ B3 U2 t/ o+ p8 ~9 H公仔箱論壇3. Same method if is not equal on 2nd try.