1. 1st divide to half take the heavier out ; k N5 _0 T& c' b: Z: X) 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) - g) \. c7 ]: }$ W; T, K1 A- s公仔箱論壇3. Same method if is not equal on 2nd try.