put 3 balls on each side,
$ O! E( z; E4 y! [& J7 G% e1 @/ @if balance, we can prove that all 6 balls on the 天平 is normal,
" t0 W- w+ c1 [1 Iif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb# l5 V# N1 ~% {/ L2 N4 H0 I8 B& m
then use the proved-normal ball on one side and put the other ball on other side 2 D9 _) k5 E; ~( ^
to determine the abnormal is heavy and light |