1. 1st divide to half take the heavier out公仔箱論壇8 N8 ?( w6 F# t
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)/ c( ]9 T3 V! Z2 ]) a8 [2 U$ n
3. Same method if is not equal on 2nd try.