1. 1st divide to half take the heavier out公仔箱論壇 I8 _' w, R! p! h8 \
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)公仔箱論壇: |% p, @* }# y/ v
3. Same method if is not equal on 2nd try.