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divde the 12 balls into 3 sets of 4.
# U2 T# c5 b+ [: c8 BTVBNOW 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.
9 j7 ~, q3 Q7 }6 {公仔箱論壇if the 2 sets are equal, then you know the heavy one is in the third' E1 ^0 ]( H7 o$ R) a
if one of the 2 is heavier, then the heavy one is in that set
. i( R7 B" o* D7 H6 a% I7 e; i4 c$ h5.39.217.77then divide the 4 balls into 2.
4 M5 ^" G. N5 [1 W9 b$ B1 y公仔箱論壇weigh themTVBNOW 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。( g' H% L" g9 v
and divide the heavier into 1
6 y) ^3 H6 k8 X$ _% I7 H5.39.217.77and weight them.
) |% f3 I) n( [% E& q# }4 etvb now,tvbnow,bttvb3 x weighing and get the ans.  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。5 g5 ^: ~7 H5 f6 C
in less than 15 secs.