put 3 balls on each side,
( Z' `) t T0 N. Y5 [if balance, we can prove that all 6 balls on the 天平 is normal, " X, d/ e/ t+ M
if not balance, we can prove that the 6 balls outside the 天平 is normal.: B- a$ C* s5 ]3 e
then use the proved-normal ball on one side and put the other ball on other side tvb now,tvbnow,bttvb! l; i" R1 _' O# w2 T5 Z
to determine the abnormal is heavy and light |