ceteriz

divde the 12 balls into 3 sets of 4.
2 X+ d) ~% U8 u) V# A# _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。weight any 2 sets.
7 a% l- C- |; u* _/ b, Eif the 2 sets are equal, then you know the heavy one is in the third公仔箱論壇& V# W# H( J" O. A( @
if one of the 2 is heavier, then the heavy one is in that set
5 U+ V4 S+ K1 J5 e8 Gthen divide the 4 balls into 2.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。  J5 o( r/ n7 g
weigh them
' Q! f* l4 R- B7 j( HTVBNOW 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。and divide the heavier into 1
7 D0 v( X: M0 Q/ L4 ^) ETVBNOW 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。and weight them.
- P) q  s% |5 h# ?5.39.217.77:88983 x weighing and get the ans.  8 L8 U& Q- ]  [; p' e6 g
in less than 15 secs.