ceteriz

divde the 12 balls into 3 sets of 4. tvb now,tvbnow,bttvb7 ]' h9 J7 U$ [2 P- c5 y
weight any 2 sets.. ~9 L7 M6 l$ I2 [- y
if the 2 sets are equal, then you know the heavy one is in the third
1 Q  j/ c% U  U2 {5.39.217.76if one of the 2 is heavier, then the heavy one is in that set
0 x) L9 |5 z# L  Tthen divide the 4 balls into 2.) e# a7 K7 F; f. l2 H5 w% r! ^
weigh them
/ _$ G6 a$ X$ b3 n0 R; Y' a5 {tvb now,tvbnow,bttvband divide the heavier into 1
" h- `0 b0 _: }- p  k% H) N公仔箱論壇and weight them.# P3 M$ _- `( }3 K/ K/ n( N/ Y
3 x weighing and get the ans.  
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