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Old 04-05-2004, 11:56 AM Thread Starter
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Put on your thinking caps!

Ok, I need some insight here. This is a question that we have to answer in my Computer Organization class (don't ask me how it relates)...

"A missionary lost in Southern California stops at a fork in the road. He knows that two motorcycle gangs inhabit the area, one of which always tells the truth and one of which always lies. He wants to know which road leads to Disneyland. What question should he ask?"

This has been bugging me for 4 days now. Keep in mind you can only ask one question.

~Jeff

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Old 04-05-2004, 12:15 PM
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Turn around, disneyland sucks.
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Old 04-05-2004, 12:21 PM
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I've heard this before (not verbatum, but very similar). I used to know the answer to this, but I can't think of it right now. I'll go off and think about it while I'm at class.

Joe

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Old 04-05-2004, 12:38 PM
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One question only? Or one question for each motorcycle gang?

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Old 04-05-2004, 12:39 PM Thread Starter
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One question only.

~Jeff

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Old 04-05-2004, 12:45 PM Thread Starter
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Quote:
Originally posted by RyanG
Turn around, disneyland sucks.
Please state your answer in the form of a question.

~Jeff

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Old 04-05-2004, 12:46 PM
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Yeesh my head hurts.

Unless there's some hidden condition I'm not aware of, you could ask the gang : "What would the other motorcycle gang tell me? Road A or Road B?" If it's the gang that tells the truth, they'll tell you truthfully the wrong road. If it's the gang that always lies, they'll lie to you and tell you the wrong road. Either way, you know which road is the wrong way, so you take the other road.

I think.

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Old 04-05-2004, 12:50 PM Thread Starter
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I think that would work! The only thing is that you don't know which gang is which. But if the gang that tells the truth tells you the road the lieing gang would say, and they lieing gang tells you the wrong road, then you have a match and should go down the other road. That's it, it has to be!

~Jeff

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Old 04-05-2004, 12:53 PM
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Ask them one of the gangs for a map.

Meh.
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Old 04-05-2004, 01:00 PM
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assured negative

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Old 04-05-2004, 01:15 PM Thread Starter
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Quote:
Originally posted by tommywdetroit
Ask them one of the gangs for a map.
Yeah, that was one of my first thoughts. But what if they don't have one?

~Jeff

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Old 04-05-2004, 01:22 PM
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you can't ask directly "does this road take me to disneyland" you have to ask something outside of that...something like "where does this road take me?"

have to get them to answer it for you ....hmmmmmmmmmm

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Old 04-05-2004, 01:25 PM
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oh, and the question directly relates to computer organization. You're attempting to force a user to put what is ideally 100% valid info, regardless if they know what they're doing or not

I think inuyasha! got the right idea...

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Old 04-05-2004, 01:25 PM Thread Starter
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If you were to ask "where does this road take me?", then it would still be up in the air. Both gangs would give an answer, but you still wouldn't know which gang is telling the truth. I'm still with inuyasha on this one.

~Jeff

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Old 04-05-2004, 01:33 PM
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Quote:
Originally posted by JeffTBird93
If you were to ask "where does this road take me?", then it would still be up in the air. Both gangs would give an answer, but you still wouldn't know which gang is telling the truth. I'm still with inuyasha on this one.
but you still only have 1 question to ask, not two, so you're still unsure who is telling the truth and who isn't.

There's some sorta blend of both inuyasha!'s question and mine that'd have to work. can't ask two questions in one, like "if you're the group of liars, which way would you tell me disneyland is" -- that make it somewhat easier

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Old 04-05-2004, 01:44 PM Thread Starter
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If you were to go with inuyasha's answer, you wouldn't need to ask two questions. You just ask both gangs what the other gang will say.

~Jeff

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Old 04-05-2004, 01:49 PM
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but you said you can only ask 1 question, not two?
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Old 04-05-2004, 01:50 PM
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inuyasha's answer is correct.

you can ask "which road will the other gang say is the road to Disneyland?" and then use the other road cause you will get the wrong one (you always get the oposite of what you ask because one gang always lies).

But the best question is "Which road will the other gang say is NOT the road to Disneyland?" and then you have the correct road without having to add the take the oposite road clause.

trust me and inuyasha, I have been driving people crazy with a variant of this riddle for years.

rob

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Old 04-05-2004, 01:52 PM
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How would askin what the other would say solve it?

Gang A = honest
Gag B = liars

You ask A they tell you B will lie. You ask B they tell you A will lie. Then you still don't know which is which.

Sam
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Old 04-05-2004, 01:56 PM Thread Starter
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Look at it this way...

Gang A - Honest
Gang B - Liars

Road 1 - Right
Road 2 - Wrong

You ask A what the other gang will say. They tell you the truth by saying B will tell you Road 2 (which is the wrong road).

You ask B what the other gang will say. They lie and tell you that the honest gang will say Road 2 (still the wrong way).

When you combine both answers, you know that Road 2 can not possibly be the right road.

~Jeff

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Old 04-05-2004, 01:57 PM
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Makes more sense the way you say it Your right, I am wrong...

Sam
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Old 04-05-2004, 01:57 PM
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That's the point, you ALWAYS get the oposite of what you ask for because of the gang that lies.

the best way is to draw it out and label the gangs and roads and then you will see how it works.

but, yeah I know, the answer is almost as complicated as the riddle.

rob

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Old 04-05-2004, 02:01 PM
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Quote:
Originally posted by slayer
How would askin what the other would say solve it?

Gang A = honest
Gag B = liars

You ask A they tell you B will lie. You ask B they tell you A will lie. Then you still don't know which is which.

Sam
Gang A = honest
Gang B = liars
Path 1 = disneyland
Path 2 = hell

Ask gang A what gang B will say is the road to disneyland. Gang A always tells the truth, so they will tell you Gang B will tell you Path 2 will take you to disneyland since gang B always lies.

Now lets say instead of asking gang A you asked Gang B.

Ask gang B what gang A will say is the road to disneyland. Gang B always lies, so they will tell you Path 2, because Gang A would really tell you path 1.

So you can deduct path 2 is the wrong road.
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Old 04-05-2004, 02:06 PM
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But to impress your professor, I would ask for the road that does not go to disney, that way you don't have to add the take the oposite road thing.

rob

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