divde the 12 balls into 3 sets of 4. 公仔箱論壇 o8 g% @$ \' b* w
weight any 2 sets.
+ W7 S% T* p' x+ L3 y% Ttvboxnow.comif the 2 sets are equal, then you know the heavy one is in the third
* S9 w6 o& F7 I6 Y z: J; Eif one of the 2 is heavier, then the heavy one is in that set1 X5 n, l1 d2 K( K+ ?, i
then divide the 4 balls into 2.公仔箱論壇1 ^7 Q! n7 A3 v; F; I- f
weigh them
! w% @! P$ [2 h; f; n6 Pand divide the heavier into 1
8 |2 Q9 J& O7 C# v& b2 [/ `7 m4 ^tvb now,tvbnow,bttvband weight them.tvb now,tvbnow,bttvb) i, w0 R1 V) Z8 q2 ]/ C
3 x weighing and get the ans. " \$ S. u. }& [! Q% @( i
in less than 15 secs. |