put 3 balls on each side, tvb now,tvbnow,bttvb4 w: q2 [1 O* D$ Z& F% _/ [
if balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇 ]; c. T7 B1 Q' }
if not balance, we can prove that the 6 balls outside the 天平 is normal.
0 a1 d' O4 `- O9 E2 G5.39.217.76then use the proved-normal ball on one side and put the other ball on other side
* A4 W! T$ t4 `* G; [/ xto determine the abnormal is heavy and light |