1. 1st divide to half take the heavier out公仔箱論壇9 M4 h( W2 u5 ?6 l
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) ; k# E' L X0 I4 b4 a5 Mtvb now,tvbnow,bttvb3. Same method if is not equal on 2nd try.