divde the 12 balls into 3 sets of 4.
/ f' S5 b6 s, E, b( O2 t& Uweight any 2 sets.
% P! `* L4 d3 F# h5 F+ [if the 2 sets are equal, then you know the heavy one is in the third
3 c' e) I' H: J: a' K l/ Otvb now,tvbnow,bttvbif one of the 2 is heavier, then the heavy one is in that set
5 \. w F [( v# f( W, B2 _, }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。then divide the 4 balls into 2.
; ~' O2 \+ Q! t# F r公仔箱論壇weigh them" ^, `, y3 g. U8 ]' S( A
and divide the heavier into 1 [, r8 g5 u" R( Z/ l* @+ e. g
and weight them.& D6 e" |* w8 a3 w
3 x weighing and get the ans.
+ _; y; Y6 U9 v% m/ \- Yin less than 15 secs. |