put 3 balls on each side,
2 k; ?' C% s+ b5.39.217.77:8898if balance, we can prove that all 6 balls on the 天平 is normal, 5.39.217.77:88988 C" y! F2 \$ W
if not balance, we can prove that the 6 balls outside the 天平 is normal.公仔箱論壇4 b4 }* k/ |3 L! Q
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇" x! l6 r3 Y* r7 `. G8 y: B
to determine the abnormal is heavy and light |