put 3 balls on each side,
! T' k) b* r& B1 C; J5.39.217.77if balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb* R$ ?: i% o( Q6 v1 ?8 ?' M
if not balance, we can prove that the 6 balls outside the 天平 is normal.
6 D/ _9 o. m5 M6 |then use the proved-normal ball on one side and put the other ball on other side
" g8 q$ Q2 r- X" _# {to determine the abnormal is heavy and light |