原帖由 stupid818 於 2008-4-17 11:42 PM 發表 
; }3 y0 \2 u; y0 Y5.39.217.76first, compare 6 and another 6. they must have difference. + G& b. }' H6 I2 h
second, divide those 6 heavier one into two, each has 3. u will find difference again.
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but the question has not defined whether the abnormal ball is heavier or ligher than normal ones .... |