put 3 balls on each side, tvb now,tvbnow,bttvb) ]/ y% k2 u3 m+ w' c
if balance, we can prove that all 6 balls on the 天平 is normal,
8 F3 |2 |+ M* Tos.tvboxnow.comif not balance, we can prove that the 6 balls outside the 天平 is normal.os.tvboxnow.com; F3 Y1 i4 }+ U w. x4 C( U
then use the proved-normal ball on one side and put the other ball on other side
6 |' t1 v. W' j4 @. ito determine the abnormal is heavy and light |