put 3 balls on each side,
' Z$ I7 T/ p' I. _& V. w; P1 F- }- f公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal, tvb now,tvbnow,bttvb( q+ ^$ k0 O6 g4 b* A5 e# K2 c+ k
if not balance, we can prove that the 6 balls outside the 天平 is normal.
7 F- U2 [# W/ S& S0 Bthen use the proved-normal ball on one side and put the other ball on other side 9 m$ c9 C) T: k- _3 q
to determine the abnormal is heavy and light |