ceteriz

divde the 12 balls into 3 sets of 4. 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。& \3 `6 a2 U: f! S  B+ H
weight any 2 sets.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。# u1 q; V8 l/ Q
if the 2 sets are equal, then you know the heavy one is in the thirdTVBNOW 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。9 c6 T, {1 g0 M& {- z5 J( f- z
if one of the 2 is heavier, then the heavy one is in that set
' y9 E2 f4 Z1 W# W* \tvboxnow.comthen divide the 4 balls into 2./ R! \7 G4 |# D+ H3 P- r
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。# ?2 {" Q) ^; ^0 ^1 b
and divide the heavier into 1
, r. ?3 _2 {; X8 Q, _tvboxnow.comand weight them.tvboxnow.com% D4 s+ V* n4 E& A+ ]
3 x weighing and get the ans.  tvboxnow.com% B1 `" x" u6 l3 @* I
in less than 15 secs.