put 3 balls on each side,
/ Y Q* X" x& F! y) s/ a. vwww3.tvboxnow.comif balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb& C: f; u) _5 ^+ _: }1 j3 W% B
if not balance, we can prove that the 6 balls outside the 天平 is normal.公仔箱論壇+ d7 z# J2 c' K2 D7 F0 Y
then use the proved-normal ball on one side and put the other ball on other side
5 B; t/ P2 `5 N' G! gto determine the abnormal is heavy and light |