put 3 balls on each side,
& I: P; J6 r2 e! N- y" c5 o+ ~5.39.217.76if balance, we can prove that all 6 balls on the 天平 is normal,
% L* M* w( n9 B0 t. O& V9 J- T9 R/ Bif not balance, we can prove that the 6 balls outside the 天平 is normal.
& F/ S: ^+ m+ R6 h1 G/ |0 L9 |then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇/ a* S, p+ R7 m) U$ b$ G
to determine the abnormal is heavy and light |