Another Problem encountered in Quant Interview

12 Marbles, 1 is odd in weight, and all the rest 11 are equal in weight. You have a balance scale. Within three weighings, how do you figure out which one is the odd one and whether it is heavier or lighter than one of the other 11?

所有跟帖： 

• should group them 6,6 then 2,2,2 and then 1, 1, right? -tsrj73- ♂ (0 bytes) () 09/19/2009 postreply 09:07:25

• Group them in three each. Weigh twice. Then... -^V^- ♂ (0 bytes) () 09/19/2009 postreply 14:57:38

• This is the correct answer -小兔子123- ♀ (0 bytes) () 09/29/2009 postreply 00:14:04

• 回复：NoOne gets this right yet -kingoftheworld- ♂ (0 bytes) () 09/20/2009 postreply 08:18:38

• group in 4... -没得吃- ♀ (0 bytes) () 09/20/2009 postreply 20:47:42

• 难道又是华尔街的精英们就是这样忽悠大众把口袋掏空的。呵呵。 -九阳- ♂ (45 bytes) () 09/22/2009 postreply 18:01:05

• 回复：Another Problem encountered in Quant Interview -listeriabacillus- ♂ (81 bytes) () 09/22/2009 postreply 22:02:32

• 回复：Another Problem encountered in Quant Interview -yhz04- ♂ (8 bytes) () 10/29/2009 postreply 18:06:11

• 回复：回复：Another Problem encountered in Quant Interview -yhz04- ♂ (565 bytes) () 10/29/2009 postreply 18:17:22