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Making a fair choice


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19 replies to this topic

#11 amateur_reborn

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Posted 20 August 2013 - 10:09 PM

Spoiler for One way?


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#12 DeGe

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Posted 21 August 2013 - 09:41 AM

 

The fourth person could be influenced by any of the three!

How can a random person, whom none of them has ever met, be influenced on such a mundane choice? And don't say money, because it would make no sense to pay someone for such a simple thing.

How will you decide who will choose the "random person" then when the only contact they have is through emails?

 

they can agree to random chance it.

roll a dice. 1 or 4 equals restaurant 1, 2 or 5; 2; 3 or 6, 3

Who will roll the dice then?


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#13 DeGe

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Posted 21 August 2013 - 09:44 AM

Spoiler for One way?

What if C thinks that A and B will rig the outcome by changing the restaurant codes once they know the value from C? A possibility if both A and B do not like the restaurant chosen by C?


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#14 DeGe

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Posted 21 August 2013 - 09:56 AM

Aha, ok then here's another idea:

Spoiler for

 

Although technically speaking, I don't think there is any flaw in this solution, using this method is way too complicated.


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#15 kukupai

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Posted 21 August 2013 - 10:31 AM

Spoiler for is this fair enough?


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#16 amateur_reborn

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Posted 21 August 2013 - 07:51 PM

 

Spoiler for One way?

What if C thinks that A and B will rig the outcome by changing the restaurant codes once they know the value from C? A possibility if both A and B do not like the restaurant chosen by C?

 

My assumption was that A, B, C have no preference other than their own favorite restaurant. If C picks up his own favorite restaurant out of X, Y and Z through blind luck (1/3 probability), then A and B have to agree upon a restaurant between A and B's choice to circumvent C's fair selection. They would be each rooting for their own favorite and won't be able to reach a compromise. 

 

In any case, C can always demand a password protected document with the actual translation of X,Y and Z before making the choice. Once C makes the choice, then A or B can reveal the password so that C can open the document and confirm the choice made. Of course, this still leaves the option of C breaking the password if he's a master hacker or something. But I think that would be a stretch and can still be avoided by using a very strong password (encrypting) and asking C to make his choice within a minute of getting the details (so that he won't have time trying to unlock the code). They can all be online to make sure C responds immediately.


Edited by amateur_reborn, 21 August 2013 - 07:53 PM.

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#17 phil1882

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Posted 22 August 2013 - 10:03 PM

who rolls the dice? what difference does that make?

random is random; assuming they aren't professional crap shooters.

 

if you really insist, they could each roll 1 dice and take the %3 total restaurant.


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#18 phaze

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Posted 23 August 2013 - 01:49 AM

@Phil Ok, since you rolled a 1, and DeJe rolled a 3, I will say I rolled a 4 or a 1 so we are all going to Porkys Slop Barn


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#19 DeGe

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Posted 23 August 2013 - 01:55 PM

In any case, C can always demand a password protected document with the actual translation of X,Y and Z before making the choice. Once C makes the choice, then A or B can reveal the password so that C can open the document and confirm the choice made. Of course, this still leaves the option of C breaking the password if he's a master hacker or something. But I think that would be a stretch and can still be avoided by using a very strong password (encrypting) and asking C to make his choice within a minute of getting the details (so that he won't have time trying to unlock the code). They can all be online to make sure C responds immediately.

This is the key point. It prevents any cheating and is fair to all 3.


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#20 kestrelknight

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Posted 25 August 2013 - 05:47 AM

:offtopic: I just want to say that there are a lot of newbies on the logic puzzle forums. As awesome as that is, I'd just like to mention how lonely we are on the word puzzle forums... Alright, I'm done.  :thanks:


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