put 3 balls on each side,
" h2 y- ~9 F4 p0 h( }tvb now,tvbnow,bttvbif balance, we can prove that all 6 balls on the 天平 is normal, 公仔箱論壇: p2 M/ b2 t3 U) r6 F
if not balance, we can prove that the 6 balls outside the 天平 is normal.os.tvboxnow.com; J3 J- G( y8 c7 j" u
then use the proved-normal ball on one side and put the other ball on other side 公仔箱論壇; N; N7 U2 H0 Y0 I
to determine the abnormal is heavy and light |