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Riddle of Kings


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Three castles, each occupied. One of them is king, other 2 are not. One always tells the truth, the other 2 always lie. Red and yellow castles are by the lake, green castle is not.

The three each make a statement:

Green: I am the king.

Yellow: I am not the king.

Red: The king lives by the lake.

The riddle's question: in which castle is the king?




Green must be lying since green's statement means yellow would true as well.

Since green is not the king, red statement must be true, since king must be by the lake. Since red is true, yellow must be false. Which means yellow castle has the king. And the king is a liar.


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