put 3 balls on each side,
/ |! F0 C+ J8 [% }, Q, o1 |! Tif balance, we can prove that all 6 balls on the 天平 is normal,
D& f1 R- z7 aif not balance, we can prove that the 6 balls outside the 天平 is normal.
/ q& z4 D+ {$ I W- S. athen use the proved-normal ball on one side and put the other ball on other side
9 L4 b& i" n1 y0 t8 T1 Ftvb now,tvbnow,bttvbto determine the abnormal is heavy and light |