1. 1st divide to half take the heavier out% H, n6 E( T2 n+ N) T$ K
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) + |' P4 _$ Z4 b, l( x8 U2 U公仔箱論壇3. Same method if is not equal on 2nd try.