divde the 12 balls into 3 sets of 4.
5 Q( F. Z, D" B; S0 {公仔箱論壇weight any 2 sets.
/ f! h4 ^7 f. i公仔箱論壇if the 2 sets are equal, then you know the heavy one is in the third
" ~% r# i% d; a& K! d) |* x: Sif one of the 2 is heavier, then the heavy one is in that set0 a- F: i$ S# o, F* I! H) {
then divide the 4 balls into 2.
, x8 Q7 I9 [4 nweigh them
; @6 [5 L. _( z7 ]& a8 g公仔箱論壇and divide the heavier into 1" z- A1 i! L& ]2 V$ I9 ^! J/ f3 y
and weight them.
% f" A3 M8 F9 S8 `2 `/ jwww3.tvboxnow.com3 x weighing and get the ans.
2 c! c: M5 W: o( Ktvb now,tvbnow,bttvbin less than 15 secs. |