put 3 balls on each side,
, R- \8 _1 Y s( P" C% tif balance, we can prove that all 6 balls on the 天平 is normal, 6 u1 G# q& C$ W1 V
if not balance, we can prove that the 6 balls outside the 天平 is normal.6 w* E7 `; r" g( A
then use the proved-normal ball on one side and put the other ball on other side
: q/ r7 E5 R% @6 Wtvb now,tvbnow,bttvbto determine the abnormal is heavy and light |