divde the 12 balls into 3 sets of 4.
( N% X% m* w0 w; l9 G7 e9 O! \weight any 2 sets.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。2 k3 g0 j- j) H8 T; x
if the 2 sets are equal, then you know the heavy one is in the third
; N3 Z3 C, S' T- ~) J( g% H# S# \if one of the 2 is heavier, then the heavy one is in that set公仔箱論壇8 w$ K: v' Y7 ]9 Y+ u2 z2 v# t. T
then divide the 4 balls into 2.0 v, z+ G. K' N# e! K4 Y
weigh them
" w w5 y- A6 F* X+ t2 ctvb now,tvbnow,bttvband divide the heavier into 1公仔箱論壇, r: Q( w, n8 {: ~1 M: E) e4 r0 {4 D* [
and weight them.
; a& x3 s5 I. [; c! @8 T$ J$ u# z3 x weighing and get the ans. 6 y! V- G0 e1 \( ~* s
in less than 15 secs. |