put 3 balls on each side, 公仔箱論壇: f4 Q+ o* j8 d2 ^( V
if balance, we can prove that all 6 balls on the 天平 is normal,
: L9 Q6 {0 ]6 Q; U/ M5 Lif not balance, we can prove that the 6 balls outside the 天平 is normal.
$ y6 f$ W. [7 \) ]( Rthen use the proved-normal ball on one side and put the other ball on other side
( k% H; B) R% g, {3 Atvb now,tvbnow,bttvbto determine the abnormal is heavy and light |