put 3 balls on each side,
* t6 m6 T" x: Z0 L; P" d; g* z5 Nif balance, we can prove that all 6 balls on the 天平 is normal, www2.tvboxnow.com& h1 D' q9 u* N
if not balance, we can prove that the 6 balls outside the 天平 is normal.; C) y$ j1 s- z8 t$ v6 c
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇 g" x4 u' l' q6 ^: b
to determine the abnormal is heavy and light |