put 3 balls on each side,
, y. U# V" o5 k8 U: [公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal,
& H, K0 l9 w" X! G' P$ }if not balance, we can prove that the 6 balls outside the 天平 is normal.公仔箱論壇! V& @: F/ ~# d5 z7 H3 ?6 c
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇* h0 p* t' D5 i7 S7 X
to determine the abnormal is heavy and light |