put 3 balls on each side,
" k" H4 m% C9 w公仔箱論壇if balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇$ T! p4 \3 S2 Z
if not balance, we can prove that the 6 balls outside the 天平 is normal.
7 Z2 o& x: ]' M. j; e& ~公仔箱論壇then use the proved-normal ball on one side and put the other ball on other side
: r, ~& e" T, u& v& ?- A2 V0 ~公仔箱論壇to determine the abnormal is heavy and light |