put 3 balls on each side, tvb now,tvbnow,bttvb* V1 p9 c9 |# j3 \" B, p$ M4 u
if balance, we can prove that all 6 balls on the 天平 is normal,
! E1 L% m8 R2 p6 i2 A) S, t! _if not balance, we can prove that the 6 balls outside the 天平 is normal.
! i9 s* d: i3 g. B" athen use the proved-normal ball on one side and put the other ball on other side
7 C0 m5 ^3 S2 d* A4 Y- ]8 D2 Fto determine the abnormal is heavy and light |