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。+ u. |! ^2 l% d3 N& ~0 d8 Z
weight any 2 sets.5.39.217.77:8898: M5 X( d# J# z+ ?2 N
if the 2 sets are equal, then you know the heavy one is in the thirdtvb now,tvbnow,bttvb* z i4 R1 }1 V: T
if one of the 2 is heavier, then the heavy one is in that set
) y, ?) g& n, r" Zthen divide the 4 balls into 2.
: i+ j) n/ B2 G; b3 a. NTVBNOW 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。weigh them
] w c% r! }- Z1 [and divide the heavier into 1) O _9 E4 E0 K4 `* c0 o6 c8 R( j" y
and weight them.公仔箱論壇& R( w* W, Q" r' F# B2 f/ e
3 x weighing and get the ans.
. ]) j! q0 |' \6 \% ~1 Sin less than 15 secs. |