put 3 balls on each side,
: i' S8 \( Q7 A9 P' h& b: n5.39.217.76if balance, we can prove that all 6 balls on the 天平 is normal,
6 }7 L) w0 s+ Z' d+ btvb now,tvbnow,bttvbif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb7 E/ M, m) K* _% w
then use the proved-normal ball on one side and put the other ball on other side
7 Q$ E) I; a; ]( ftvb now,tvbnow,bttvbto determine the abnormal is heavy and light |