put 3 balls on each side,
6 O9 o' n( T7 B; Tif balance, we can prove that all 6 balls on the 天平 is normal, ; ^; k1 S( s, x/ R% o: v
if not balance, we can prove that the 6 balls outside the 天平 is normal., h Q6 i) @' N$ Y5 _
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇& L; [ a) s) V7 s, W
to determine the abnormal is heavy and light |