put 3 balls on each side, 8 q# J& p4 }. s1 S' Y4 V1 H
if balance, we can prove that all 6 balls on the 天平 is normal,
# n$ y) m; p+ {9 wif not balance, we can prove that the 6 balls outside the 天平 is normal.公仔箱論壇+ e+ W! P: J! K5 E% e
then use the proved-normal ball on one side and put the other ball on other side www1.tvboxnow.com# ?2 y4 o6 w. }) g
to determine the abnormal is heavy and light |