divde the 12 balls into 3 sets of 4.
`1 k' A* b6 f+ `7 e. d0 q1 y' Y6 Mweight any 2 sets.
$ G: F2 ?) w% [! L1 |: \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。if the 2 sets are equal, then you know the heavy one is in the third
5 a. o) [4 c4 ?公仔箱論壇if one of the 2 is heavier, then the heavy one is in that set
) G j: e' n2 E2 h; W) C+ m! [" H7 tthen divide the 4 balls into 2.
8 F# y, @* o6 o( {! q7 J公仔箱論壇weigh themtvb now,tvbnow,bttvb: i# j3 _# r) ]6 |; E
and divide the heavier into 11 M" f; Z2 y4 H% B# l6 _
and weight them.
: ^! q# [! o( z* A4 X公仔箱論壇3 x weighing and get the ans.
5 x* l6 f/ @& c! o- x0 qin less than 15 secs. |