put 3 balls on each side,
0 B; Y. b; k( d/ L3 i7 Cif balance, we can prove that all 6 balls on the 天平 is normal, 5.39.217.77$ a. O2 Z! U/ w, H* B6 A$ p, m: r
if not balance, we can prove that the 6 balls outside the 天平 is normal.5.39.217.77% u$ A R x' f$ Y" m* R% b7 r
then use the proved-normal ball on one side and put the other ball on other side
, ]" ~) A* s8 z公仔箱論壇to determine the abnormal is heavy and light |