divde the 12 balls into 3 sets of 4.
2 u( Q! O- C6 jweight any 2 sets.
% B) w; x+ O$ o* ?if the 2 sets are equal, then you know the heavy one is in the third
* m; _6 _" L+ B7 g9 sif one of the 2 is heavier, then the heavy one is in that settvb now,tvbnow,bttvb" z, x' v$ }2 P7 K- t, I
then divide the 4 balls into 2.5.39.217.76/ M5 |. o( I% `/ e/ e, x% c
weigh them5.39.217.763 D9 X H+ A& B# A$ H4 d `4 i( s1 M
and divide the heavier into 1
- @! ?' I( E! B: @) n, c4 r公仔箱論壇and weight them.
& [# \ q) _) Q! B3 x weighing and get the ans. 公仔箱論壇" G* g: c, M8 a$ ?! ~% p
in less than 15 secs. |