put 3 balls on each side, & k5 [$ Q* c; M( Q7 M
if balance, we can prove that all 6 balls on the 天平 is normal,
9 l/ H* J9 [; k$ T7 [5 Tif not balance, we can prove that the 6 balls outside the 天平 is normal.
# P; P, P5 ]+ a w5 B+ M7 dthen use the proved-normal ball on one side and put the other ball on other side
. i* \& t5 U( z8 m6 N t) ]3 d" G公仔箱論壇to determine the abnormal is heavy and light |