divde the 12 balls into 3 sets of 4. # P4 K0 f5 C& a
weight any 2 sets.
$ Y) I h5 F# L& a0 X. c6 h# G8 m3 Lif the 2 sets are equal, then you know the heavy one is in the third公仔箱論壇9 o4 u$ W0 P3 G3 c+ ]8 \2 m+ F
if one of the 2 is heavier, then the heavy one is in that set
- m! t0 s& l; {$ m& F# O+ Qtvboxnow.comthen divide the 4 balls into 2.
- Q# N1 ^( g5 k( {. R$ C3 A3 h7 qtvb now,tvbnow,bttvbweigh them
3 D) D. e! x0 ~+ e, R0 cand divide the heavier into 1, h8 x( T. V2 r H
and weight them.7 ]5 a B! q1 f! c6 N! L$ W( `
3 x weighing and get the ans.
5 |0 n9 h9 G( ^, p: etvb now,tvbnow,bttvbin less than 15 secs. |