put 3 balls on each side, www2.tvboxnow.com0 m+ ~& `/ i+ r) J8 G# X
if balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb. w# J0 d. `/ u4 W5 j3 h
if not balance, we can prove that the 6 balls outside the 天平 is normal.
7 L" b% q7 d6 ^8 p4 Dthen use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇& t/ g7 \" Q; V
to determine the abnormal is heavy and light |