put 3 balls on each side, 0 X$ {' A4 I/ R& y8 N. J: E
if balance, we can prove that all 6 balls on the 天平 is normal,
0 ~3 P3 @1 `! Z7 L; B6 o9 a8 Los.tvboxnow.comif not balance, we can prove that the 6 balls outside the 天平 is normal.
7 [. F: F* {3 S! K: g. M0 h公仔箱論壇then use the proved-normal ball on one side and put the other ball on other side
! e. G9 E+ F) Y5 w6 gto determine the abnormal is heavy and light |