put 3 balls on each side, 7 {, A2 V; V) t0 p
if balance, we can prove that all 6 balls on the 天平 is normal,
9 a) w, @' k( }# _tvboxnow.comif not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb% m6 l4 y% E# p5 O2 b
then use the proved-normal ball on one side and put the other ball on other side
0 H% j, v$ f8 btvb now,tvbnow,bttvbto determine the abnormal is heavy and light |