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| 20 May 2013 08:22 PM |
PUZZLE: Peter and Paul are twin brothers. One of them (We don't know which) always lies. The other one always tells the truth. I ask one of them: "Is Paul the one that lies?" "Yes" he answers. Who did I speak to?
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| 20 May 2013 08:52 PM |
I spoke to Peter. If a person always lies always tells the truth, he cannot admit that he is lying (if this person were a liar, he would be telling the truth, and if this person were honest, he would be lying). Then, Paul could not have answered my question. Peter could answer about Paul without contradicting himself. What we don't know is who the liar is :p
-BonQuiQui- |
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| 20 May 2013 08:55 PM |
| I think it's Peter. It can't be Paul because if he answered, it would be a paradox, since if he did lie he can't say yes neither can he tell the truth because he'd be admitting to the lies. |
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worriorx5
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| Joined: 08 Oct 2010 |
| Total Posts: 2368 |
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| 21 May 2013 04:16 AM |
| I agree with Smiley and Undefeated. You see, Peter is actually the liar, not Paul. See, if you asked Paul then he would be lying either way. I don't really know how to explain it, but if you read Smiley's post you will understand it. |
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GL00P
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| Joined: 08 Feb 2009 |
| Total Posts: 693 |
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| 21 May 2013 04:26 AM |
| Peter becaus u asked him does the other guy lie |
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