divde the 12 balls into 3 sets of 4.
9 L! Y# b G I. V5.39.217.76weight any 2 sets.
+ v* p3 y" ?* P# Mtvb now,tvbnow,bttvbif the 2 sets are equal, then you know the heavy one is in the third
) X( I3 p7 x2 i) H9 ^3 iif one of the 2 is heavier, then the heavy one is in that set
* R8 u7 F3 W5 n2 Z$ a* d% g/ f! ]+ j5.39.217.76then divide the 4 balls into 2.
4 O2 w, S7 j8 U% h% ?5.39.217.76weigh them
: s l& l" h9 Gand divide the heavier into 1
, G6 ]; h! E7 `+ u t) w4 Iand weight them.
" h" _. s- a2 h1 n& |! L公仔箱論壇3 x weighing and get the ans.
! V4 ^, x& l) c+ L! J9 q公仔箱論壇in less than 15 secs. |