put 3 balls on each side,
" n' M1 J F, c/ y2 V9 d- e0 c* H5.39.217.76if balance, we can prove that all 6 balls on the 天平 is normal, 2 L6 |/ F, ]8 E
if not balance, we can prove that the 6 balls outside the 天平 is normal.
' M( ^9 t* P4 {" H& U" @tvb now,tvbnow,bttvbthen use the proved-normal ball on one side and put the other ball on other side
( a- H7 s; k. |" C0 f% L% Z6 `公仔箱論壇to determine the abnormal is heavy and light |