1. 1st divide to half take the heavier out : d* \/ L- B( A/ n' |& K/ V' i2. 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) # b6 k; Z5 }9 r% }公仔箱論壇3. Same method if is not equal on 2nd try.