ceteriz

divde the 12 balls into 3 sets of 4. 0 F. z0 a# {1 _9 Z6 N7 G8 \
weight any 2 sets.公仔箱論壇! b+ I; F2 t! M7 g
if the 2 sets are equal, then you know the heavy one is in the third5.39.217.774 n5 ]7 c/ X+ ]2 b; }% V/ Z
if one of the 2 is heavier, then the heavy one is in that set
- f0 q* f# Q) D- V7 z公仔箱論壇then 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。1 S! T( K* @+ k: `
weigh them
- n: S& E  Q, ^& |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。and divide the heavier into 1公仔箱論壇2 f/ t) p; D$ e$ E7 r# p( _
and weight them.公仔箱論壇4 Q8 O" h" s2 q! F8 h& M
3 x weighing and get the ans.  公仔箱論壇5 A0 R0 ?7 z3 N# S6 {- W) y
in less than 15 secs.