put 3 balls on each side, V( Z8 Q+ G% Z5 }0 `" R
if balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇/ z4 ]5 X% B2 n# `
if not balance, we can prove that the 6 balls outside the 天平 is normal.
% O, V J* U& l8 M8 U5 P Z* ithen use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇" [* n- q" _1 G2 Y: x
to determine the abnormal is heavy and light |