原帖由 stupid818 於 2008-4-17 11:42 PM 發表 
- d5 L& e4 P, {2 V+ h+ m" \) v4 [5.39.217.77first, compare 6 and another 6. they must have difference. # O# J$ x( W" g# C' p
second, divide those 6 heavier one into two, each has 3. u will find difference again.5.39.217.77* U% j* @ @' e$ a9 m0 a
third time, if u put 2 and they are equal, u will kno ... % Y9 r9 Y. Z3 @. {" s+ h
& M+ ]/ n6 t C3 y3 n
but the question has not defined whether the abnormal ball is heavier or ligher than normal ones .... |