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Posted on Aug 12, 2014

PUZZLE - DRAGON VERSUS KNIGHT

DRAGON VERSUS KNIGHT A dragon and a knight are trapped on a desert island. This island has seven poisoned wells, numbered 1 to 7. If they drink from a well, they can save themselves only by drinking from a higher number well within a few minutes’ time.Well 7 is located at the top of a high mountain, so only the dragon can reach it. In other words, if the dragon drinks from well 4, it will die unless it has a cup of poison from wells 5 to 7. The same is true of the knight. One day they decide that the island isn’t big enough for the two of them, and they have a duel. Both the knight and dragon are rational creatures. Each of them brings a cup of water to the duel, they exchange cups, and both drink the contents of the cup brought by his adversary. After the duel, the knight lives and the dragon dies. What strategy did the knight use to defeat the dragon?

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