put 3 balls on each side, + u" M; L( M# E' C7 C1 ]
if balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇2 w$ u2 W2 f+ M3 K( Z
if not balance, we can prove that the 6 balls outside the 天平 is normal.
3 D* c3 k9 k' e+ P- jtvb now,tvbnow,bttvbthen use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇5 b# V' F! ?1 {9 Y% f
to determine the abnormal is heavy and light |