put 3 balls on each side, 2 d. P, D4 E: K9 u; e
if balance, we can prove that all 6 balls on the 天平 is normal,
0 k' Y5 A! c: ~公仔箱論壇if not balance, we can prove that the 6 balls outside the 天平 is normal.
6 t1 T& c3 a' Y- V; ?( ~; ^then use the proved-normal ball on one side and put the other ball on other side
; q) U% a( H& x) x$ n0 L7 ]. hto determine the abnormal is heavy and light |