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divde the 12 balls into 3 sets of 4. ) a6 o2 g: P" t, |+ E# |
weight any 2 sets.TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。! B/ B; y) N% L; u
if the 2 sets are equal, then you know the heavy one is in the third
) C# E# @$ s* m2 Btvb now,tvbnow,bttvbif one of the 2 is heavier, then the heavy one is in that set
% k; G6 G! e2 y公仔箱論壇then divide the 4 balls into 2.tvb now,tvbnow,bttvb! [: }: s, q& `. N9 ~
weigh them
5 `4 L9 {5 {( L7 ftvb now,tvbnow,bttvband divide the heavier into 1www.tvboxnow.com! B( H' S2 b+ n* k
and weight them.
+ t$ v7 ^3 F* Y3 f  T3 x weighing and get the ans.  www.tvboxnow.com: h) b% M: T9 N6 H% R1 [
in less than 15 secs.