1. 1st divide to half take the heavier out公仔箱論壇9 j+ z( O3 g6 z5 X0 ^) I6 R
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) + g R: ^+ {/ l9 }3. Same method if is not equal on 2nd try.