put 3 balls on each side, # s4 D- [' X- w. d/ J$ S
if balance, we can prove that all 6 balls on the 天平 is normal,
9 h& x$ F3 u& P( g! Y! k/ Gif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb) b' a) N: S l: O' d3 D
then use the proved-normal ball on one side and put the other ball on other side 0 \& r0 ]! z: }
to determine the abnormal is heavy and light |