put 3 balls on each side, 6 y. R; ~ \2 n3 o
if balance, we can prove that all 6 balls on the 天平 is normal, # [* d' ?% V, Y# G3 J) {+ B! J
if not balance, we can prove that the 6 balls outside the 天平 is normal.
5 e+ Y" i' y( F3 r( T" u) o公仔箱論壇then use the proved-normal ball on one side and put the other ball on other side
7 k0 [' Z4 q6 Y& Etvb now,tvbnow,bttvbto determine the abnormal is heavy and light |