Can you solve this brainteaser? used to test potential IBM employees :)?!


Question: Can you solve this brainteaser!? used to test potential IBM employees :)!?
my TA told me questions like this one was given to people who wanted to work for IBM!. he asked us this in class and no one got it lol, but its actually pretty simple

picture this:

There are four people in total, and there is a big concrete wall!. Person A stands on one side of the wall, facing it!. The other three people stand in a line on the other side of the wall, also facing the wall!. Person B stands closest to the wall, facing it!. Person C stands behind him so that he sees the back of person B!. And, person D stands behind persons B and C, and sees the back of them!. Otherwise they cant see each other, and cant talk to each other or communicate in any way!.

Anyway, there are four hats in total; two red and two green!. They are randomly put on top of each persons head, and they cant see the colour of their hat!. But, the catch is that these people are in a team and within 10 minutes one person must declare that they know the colour of their own hat!.

which person is it and whyWww@Enter-QA@Com


Answers:
the middle person of the three

because if the third person sees two of the same colour hat in front of him he will know what his is

so the middle person knows his hat is different to the person in front of him

PS

this is reliant on the fact that the third person isnt an idiot and would realise his hat colour if the two in front are the same

**edit**

just to clarify

if persons B and C have red hats then person D would know he has a green hat so if person D doesnt say i have a green hat then person C must have a different hat to Person BWww@Enter-QA@Com

A has no chance!.
If B and C have the same colour hat, D can then say!.!.
If D doesnt say, then it means that B and C have different colour hats!.!.
soo then if D is quiet C will know that his hat is a different colour from person B!? :D
xWww@Enter-QA@Com

person d cause he can see person b and c hat and he could already guess what color his hat is even though there is only


2 red and 2 greenWww@Enter-QA@Com

DWww@Enter-QA@Com

D, because he can see persons C, and B and can determine witch color his hat is! I'm brilliant =)) hah jk!

luv yahWww@Enter-QA@Com

god tells person d

sorry really don't knowWww@Enter-QA@Com



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