put 3 balls on each side,
" A) j' M; D0 U6 J1 z4 h# jtvb now,tvbnow,bttvbif balance, we can prove that all 6 balls on the 天平 is normal,
" T8 D; T: `' Y) m" F% ^. a# v- Xif not balance, we can prove that the 6 balls outside the 天平 is normal.
2 s+ K$ l! A0 Yos.tvboxnow.comthen use the proved-normal ball on one side and put the other ball on other side
|( P8 K$ a& w. E9 Bto determine the abnormal is heavy and light |