原帖由 stupid818 於 2008-4-17 11:42 PM 發表 9 |. @0 \( H+ P l) c3 x7 [- [
first, compare 6 and another 6. they must have difference.
5 a; ]4 z4 Q7 U% C6 Lsecond, divide those 6 heavier one into two, each has 3. u will find difference again.5 N. z" ?$ m+ X R; w& q
third time, if u put 2 and they are equal, u will kno ... 6 ~9 O6 q& k) l8 @
; v* h$ z) I, c2 c' v$ d; _but the question has not defined whether the abnormal ball is heavier or ligher than normal ones .... |