put 3 balls on each side,
6 Z3 @/ \! p- D& `# x7 F公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇. Z( w7 W2 T0 ^: e Y/ z4 C
if not balance, we can prove that the 6 balls outside the 天平 is normal.' E) J2 O' d% T1 X) \1 t
then use the proved-normal ball on one side and put the other ball on other side
( M. d2 j j8 I" Kto determine the abnormal is heavy and light |