put 3 balls on each side,
6 X" E: j7 a, O5 D& l) i4 G公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal, www2.tvboxnow.com h( ^- P& T; R7 d+ w* [6 L
if not balance, we can prove that the 6 balls outside the 天平 is normal.1 v; r' c2 b0 G! G2 Z8 a8 q$ W A
then use the proved-normal ball on one side and put the other ball on other side
. T9 |8 }/ Q$ l1 dto determine the abnormal is heavy and light |