put 3 balls on each side, tvb now,tvbnow,bttvb- L9 r* e( u% d
if balance, we can prove that all 6 balls on the 天平 is normal, ! U- G. D0 e7 l; d8 D
if not balance, we can prove that the 6 balls outside the 天平 is normal.
' {2 x- q' f: G Ptvboxnow.comthen use the proved-normal ball on one side and put the other ball on other side
: \ t8 t8 g& rto determine the abnormal is heavy and light |