divde the 12 balls into 3 sets of 4. 公仔箱論壇( @* g/ ?$ e2 t( h
weight any 2 sets.6 u( C2 G/ I' _- \" W/ R4 Z4 F
if the 2 sets are equal, then you know the heavy one is in the third
`# L' Z% O3 B/ g4 G4 R1 Sif one of the 2 is heavier, then the heavy one is in that set
6 D1 a0 i% N5 p! stvb now,tvbnow,bttvbthen divide the 4 balls into 2.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。$ G$ v5 L! f1 c1 h
weigh them# a; P- h+ J) v4 s
and divide the heavier into 1
, C" s" L5 e! w l1 V4 [and weight them.tvb now,tvbnow,bttvb1 s5 @ T9 u' d* N2 E; N/ ]7 w
3 x weighing and get the ans.
# h \" Q, \& M- U1 `8 K: Vtvb now,tvbnow,bttvbin less than 15 secs. |