divde the 12 balls into 3 sets of 4.
2 N$ O: N3 a9 itvb now,tvbnow,bttvbweight 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。2 _" R0 T6 e8 \& A
if the 2 sets are equal, then you know the heavy one is in the third
4 O( F/ d+ o8 ^, ^; v5 iTVBNOW 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。if one of the 2 is heavier, then the heavy one is in that settvb now,tvbnow,bttvb! P. `$ }* b7 c, ^6 O+ S. b
then divide the 4 balls into 2.
% g! @6 g+ B% x8 Mtvb now,tvbnow,bttvbweigh themtvb now,tvbnow,bttvb! W9 W* ]. [; |; o' o8 O
and divide the heavier into 14 [9 y4 p% ]8 x! ^) T
and weight them.公仔箱論壇9 l# N; O, z1 K9 q1 F$ i$ e
3 x weighing and get the ans.
# P2 L( [- z4 L% |- u0 B7 nin less than 15 secs. |