divde the 12 balls into 3 sets of 4. 公仔箱論壇( ]! \- R+ i- f8 j
weight any 2 sets.
" _& P4 I. x2 p6 m7 ?" o5.39.217.76if the 2 sets are equal, then you know the heavy one is in the third& X" x9 w: n" i5 ?$ y' b: w7 E' P9 U& Y
if one of the 2 is heavier, then the heavy one is in that set
: o ~3 t( z5 F+ `, R- ~7 |then divide the 4 balls into 2.tvb now,tvbnow,bttvb& r2 j8 C( v. q
weigh them
; s* o& p- u& ~& b* i3 k. c5 HTVBNOW 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。and divide the heavier into 1
( N. d& A) B) a& `* K公仔箱論壇and weight them.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。; Z5 O' {( }8 Q% i+ q
3 x weighing and get the ans.
0 I. ], [- |5 p# R/ sin less than 15 secs. |