Angels and demons - Revision history

Vampire Library: Undo revision 647 by Ocafaromy (talk)

2010-11-24T00:14:55Z

Undo revision 647 by Ocafaromy (talk)

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	Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer.		Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer.

Ocafaromy at 23:41, 23 November 2010

2010-11-23T23:41:51Z

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			=[http://ucozisit.co.cc UNDER COSTRUCTION, PLEASE SEE THIS POST IN RESERVE COPY]=
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			=[http://ucozisit.co.cc CLICK HERE]=
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	Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer.		Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer.

Oscarlevin: Created page with 'Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer...'

2010-07-01T15:58:53Z

Created page with 'Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer...'

New page

Here is a modification of a question asked on the [http://forums.xkcd.com/viewforum.php?f=3 xkcd logic puzzle forum]. I've modified it slightly so there is (I believe) an answer.

==Puzzle==

Faced with a particularly vexing moral dilemma, two semitransparent miniature versions of you appear on either shoulder, each offering advise on the situation. From your experience with cartoons, you know that one of these characters is an angel, and the other a demon. Angels always tell the truth if they can, but demons sometimes lie and sometimes tell the truth. Of course, you wish to determine which is which, but you only have time to ask one question of one of the two. What should you ask?

==Help==

{{Hint| You can ask a single yes/no question. If assume that whoever you ask will answer with either a "yes" or "no," unless they are unable to.}}
{{Answer| "If I were to ask your friend there if he was an angel, would he say yes?"}}
{{Solution| The question can not be answered by the angel, since there is no way to know whether the demon would answer truthfully or not. The demon would either say yes or no, depending on whether he wished to lie or tell the truth.}}

==See also==

[[Two guards]]

[[Category:Liar puzzles]]
[[Category:Logic]]