I Swear to Tell the Truth

Suppose in a tribe are two kinds of people. The kind who always tell the truth and the others who always tell a lie. If someone from the tribe approaches you and says his neighbor is a liar because, according to him, his neighbor admitted it, would you believe him?

Answer
No, because no one in the tribe can admit that he is a liar. If the neighbor is really a liar, then by admitting it, he would be telling the truth. If he is the kind who always tell the truth, then by saying that he is a liar, he would not be telling the truth. You see, nobody in the tribe can admit that he is a liar. Therefore, the person that approached you has to be a liar.

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