put 3 balls on each side,
/ M4 ?( I9 N6 ~, i! }! ^( a% ?0 k5.39.217.76if balance, we can prove that all 6 balls on the 天平 is normal, " K$ p; J! t f" ^
if not balance, we can prove that the 6 balls outside the 天平 is normal.tvb now,tvbnow,bttvb, v, q( \1 q% b* F$ L7 |7 Z
then use the proved-normal ball on one side and put the other ball on other side
1 _' x/ u: l5 V( Y% nto determine the abnormal is heavy and light |