put 3 balls on each side,
" [" @8 n, I5 d3 R) L/ X: G公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal,
+ G6 j' A9 Z/ A0 a) b* X6 O4 Uif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb7 h- ~) \% j e# E2 h/ m% ~. h
then use the proved-normal ball on one side and put the other ball on other side
( F9 I& H2 g( y& v# j: ]公仔箱論壇to determine the abnormal is heavy and light |