1. 1st divide to half take the heavier out5.39.217.766 P3 F( o0 o* d- c. u
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) , q* A! r) T: K( f% F' s7 I# r/ O公仔箱論壇3. Same method if is not equal on 2nd try.