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Brain Teaser.
Jan 27 2011 09:34pm

Ðàrth Àpòçålýpsè
 - Student
Ðàrth Àpòçålýpsè
Suppose you are in a game show. There are two doors that are in front of you. One door leads to nothing the other door leads to 2 million units of exchange.

In front of each door is a man. One man always lies, the other always tells the truth. You do not know which lies and which tells the truth.

You can only ask one question to either of them. You cannot ask one question each however. Just one question in total.

What question can you ask to ensure which door has the 2 million units of exchange?
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Comments
Jan 29 2011 06:50am

Ðàrth Àpòçålýpsè
 - Student
 Ðàrth Àpòçålýpsè

pfff pfff lies
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New -[DE]- Site.

Jan 28 2011 11:39pm

Augusta_Mintaka
 - Student
 Augusta_Mintaka

It was just a more elaborate answer of the first!
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"Deos fortioribus adesse."

Jan 28 2011 09:37pm

Ðàrth Àpòçålýpsè
 - Student
 Ðàrth Àpòçålýpsè

Yes. THAT is the right answer :P
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New -[DE]- Site.

Jan 28 2011 07:27pm

Augusta_Mintaka
 - Student
 Augusta_Mintaka

If you asked the person who told the truth then he will say the other person will pick the door with nothing behind it. If you asked the liar, he will also say the other will say the door with nothing behind it. Either one will point to the wrong door if you ask them that question so you pick the opposite.

Analysis: Truth teller stands behind right door, liar stands behind wrong door.

Question: What door would the other person say had the prize behind.

Liar answer: Wrong door, because the truth teller would say the right door.

Truth teller answer: Wrong door, because the liar would say the wrong door.

Conclusion: They will both point to the wrong door, so just pick the opposite.
_______________
"Deos fortioribus adesse."

This comment was edited by Augusta_Mintaka on Jan 28 2011 07:30pm.

Jan 28 2011 06:54pm

Ðàrth Àpòçålýpsè
 - Student
 Ðàrth Àpòçålýpsè

No because the guy who tells the truth would say the right door and the guy who lies would say the wrong door. Either way you still have a 50/50.
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New -[DE]- Site.

Jan 28 2011 08:51am

Augusta_Mintaka
 - Student
 Augusta_Mintaka

Ask one what door they would pick and pick the opposite.
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"Deos fortioribus adesse."

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