ceteriz

divde the 12 balls into 3 sets of 4.
# ^8 v2 G3 G" ^* f% k" nTVBNOW 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。weight any 2 sets.+ W& ?/ m" T+ O3 G: t! V1 }
if the 2 sets are equal, then you know the heavy one is in the third
0 v1 t0 b+ ^3 \- M公仔箱論壇if one of the 2 is heavier, then the heavy one is in that set
- B! v9 Q3 K( o: ~/ |* u公仔箱論壇then divide the 4 balls into 2.公仔箱論壇* p- b4 H+ X* |8 E6 i
weigh them
' Y! i" a, j9 j/ kand divide the heavier into 1TVBNOW 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。! A5 h: r/ o, }& B; @1 d
and weight them.
" O0 d6 v) Q/ ?* y+ q* G3 x weighing and get the ans.  公仔箱論壇# O  N* I5 {3 r
in less than 15 secs.