divde the 12 balls into 3 sets of 4. 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。& Y+ I# E8 a: N
weight any 2 sets.tvb now,tvbnow,bttvb2 R+ @+ y& p" C2 k& E M/ c
if the 2 sets are equal, then you know the heavy one is in the third
- [- j% q9 | y3 }& }公仔箱論壇if one of the 2 is heavier, then the heavy one is in that set
2 y4 S* X$ t4 V7 G% p9 A% ttvb now,tvbnow,bttvbthen divide the 4 balls into 2.
- h7 _6 H' g9 {; @+ P- r5.39.217.77weigh them
9 ]& a9 B7 ?* B) \公仔箱論壇and divide the heavier into 15.39.217.773 k1 F% u( G- ?& y8 N
and weight them.
/ c* P4 x8 r% a& D6 C! t) Y! `" |. [tvb now,tvbnow,bttvb3 x weighing and get the ans.
. h0 x5 Q# `# B+ N5 C( z公仔箱論壇in less than 15 secs. |