put 3 balls on each side, 公仔箱論壇; Q! d# k4 @; g2 q" l( U9 e5 u7 v( w9 R ^
if balance, we can prove that all 6 balls on the 天平 is normal, " U% p+ d1 G9 L3 f8 Z$ w2 A
if not balance, we can prove that the 6 balls outside the 天平 is normal.
0 D# _2 G; |5 S5.39.217.76then use the proved-normal ball on one side and put the other ball on other side 5.39.217.76# B6 z! ^8 c R# K; ?* J6 i' n
to determine the abnormal is heavy and light |