put 3 balls on each side,
! {. k+ U: [- r: p+ g- Jif balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇/ x# r' x$ @: n9 {9 Y& x. d
if not balance, we can prove that the 6 balls outside the 天平 is normal.
k, J! J/ v$ V, C$ f9 Athen use the proved-normal ball on one side and put the other ball on other side : o) I7 V" y3 O, e: J! o
to determine the abnormal is heavy and light |