1. 1st divide to half take the heavier out/ F( K; s) u; X: |' g
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) 1 ~ {. u" E l; V! ~公仔箱論壇3. Same method if is not equal on 2nd try.