put 3 balls on each side,
2 U& q |4 l7 {7 Y# a" x' H公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal,
: {4 r4 i. A4 o+ i- z( R公仔箱論壇if not balance, we can prove that the 6 balls outside the 天平 is normal.
' i3 n' \& _6 S3 C4 w2 d! M5 T3 L公仔箱論壇then use the proved-normal ball on one side and put the other ball on other side
) C% b4 I) J8 R9 h2 F5.39.217.77:8898to determine the abnormal is heavy and light |