原帖由 stupid818 於 2008-4-17 11:42 PM 發表 
6 b {. n; \, `; G* X/ d |) ~first, compare 6 and another 6. they must have difference. 5.39.217.76' l8 B% Q9 z( l) s Z
second, divide those 6 heavier one into two, each has 3. u will find difference again.5.39.217.765 W6 U7 A4 r8 l8 @/ v- f" }/ b
third time, if u put 2 and they are equal, u will kno ... 公仔箱論壇* d; N" F, _9 |: T
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but the question has not defined whether the abnormal ball is heavier or ligher than normal ones .... |