put 3 balls on each side,
& w `8 @: Z( @/ w# J2 q3 \& _! ?2 w0 d5.39.217.77if balance, we can prove that all 6 balls on the 天平 is normal,
3 L* }, L0 k% E, r8 F2 u/ L公仔箱論壇if not balance, we can prove that the 6 balls outside the 天平 is normal.5.39.217.77! E$ n0 {' g( ~. J
then use the proved-normal ball on one side and put the other ball on other side
& V/ }3 T+ o7 `' W# |0 ito determine the abnormal is heavy and light |