put 3 balls on each side,
8 A3 M" y, A( A5 M' M) @tvb now,tvbnow,bttvbif balance, we can prove that all 6 balls on the 天平 is normal, * H M) o7 T5 ^0 Q
if not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb5 m% q- Q. N; L3 V9 i' M
then use the proved-normal ball on one side and put the other ball on other side
% I; J+ y) `, e$ d" f: l2 htvb now,tvbnow,bttvbto determine the abnormal is heavy and light |