put 3 balls on each side, tvb now,tvbnow,bttvb, o, {' A M' m
if balance, we can prove that all 6 balls on the 天平 is normal,
: y( u+ l2 N7 }. }0 k0 }. jif not balance, we can prove that the 6 balls outside the 天平 is normal.: S( c& m6 |+ a t
then use the proved-normal ball on one side and put the other ball on other side
9 O% s6 s9 H" S' C3 K% b! Mto determine the abnormal is heavy and light |