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divde the 12 balls into 3 sets of 4.
. t/ z. j! o# T( |( z5.39.217.76weight any 2 sets.
3 s' L+ g2 a3 B5.39.217.76if the 2 sets are equal, then you know the heavy one is in the third
3 {% C7 d" ^- X" b* M$ xif one of the 2 is heavier, then the heavy one is in that settvb now,tvbnow,bttvb9 ]2 l5 D3 S8 K2 a9 R
then divide the 4 balls into 2.
- O' ?, P6 \; v5 d' j2 W+ Kweigh them
- t, D# t3 z) `; T) _0 {5 t3 q5.39.217.76and divide the heavier into 15.39.217.76. _6 w8 T/ y* R8 B7 l" c% ~' l
and weight them.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。" o# t/ u: _  ?. x
3 x weighing and get the ans.  
. B: @8 v* I1 ^- M/ a1 e, Gtvb now,tvbnow,bttvbin less than 15 secs.