put 3 balls on each side, 公仔箱論壇9 v5 h0 M$ F; H4 n* U3 o
if balance, we can prove that all 6 balls on the 天平 is normal,
1 a9 q! P+ n8 w- l1 L. g( Q; qtvb now,tvbnow,bttvbif not balance, we can prove that the 6 balls outside the 天平 is normal.
$ ?- B$ q4 m# ]% Y: }8 E/ L8 c' z# ythen use the proved-normal ball on one side and put the other ball on other side
' e+ b. I: f( f1 w1 P; q公仔箱論壇to determine the abnormal is heavy and light |