divde the 12 balls into 3 sets of 4. tvb now,tvbnow,bttvb" L0 k1 {) L! @& x! p6 q' _
weight any 2 sets.公仔箱論壇6 J# v3 O' P+ x( J5 p
if the 2 sets are equal, then you know the heavy one is in the third
8 ~; y& P. }6 Dif one of the 2 is heavier, then the heavy one is in that set
6 n2 T6 @) |9 f* N' @! D8 Y4 G公仔箱論壇then divide the 4 balls into 2.tvb now,tvbnow,bttvb; J, v: [, ?) \6 w1 u2 @0 P* f. w
weigh themtvb now,tvbnow,bttvb- Z. P/ n E4 N- f$ F& y; }0 H( p
and divide the heavier into 10 y' C6 V) }- y0 I' P0 `9 e% ]# ?
and weight them.5.39.217.77:8898- {1 f# Y" H5 A0 N9 Z
3 x weighing and get the ans.
$ b0 o9 C& L! ]8 l0 d) O& U2 jtvb now,tvbnow,bttvbin less than 15 secs. |