1. 1st divide to half take the heavier out公仔箱論壇5 j# T% ?, j A6 Z! 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)公仔箱論壇0 C* A+ a. Z ?; s, J4 T# n
3. Same method if is not equal on 2nd try.