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Vandaag is het 20 January 2018

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Given in marriage? - logic puzzle

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King Kreso had decided that one of his daughters, princess Ikani had to marry the mean grave Gwenn. When Ikani did hear of this she started crying for days and she did not want to eat anything anymore. The king became a little bit uncomfortable with this situation, so he decided that she should take a small stone from a hat. If Ikani would take the white stone, she would have to marry grave Gwenn, if she takes the black one she would not have to. Some days later, grave Gwenn, King Kreso and Ikani are together on the lane to the castle which is paved with small black and with stones. The king asks grave Gwenn to take two stones and put it in his hat. Princess Ikani sees that the mean grave puts in two white stones. She thinks of saying this, but then most likely the procedure has to start over. Suddenly she gets a great idea. Some minutes later it is decided that princess Ikani does not have to marry grave Gwenn. What did princess Ikani do?

Explanation

She just took out one small stone, but then immediately dropped it on the lane with all the other stones. Then she claims that the stone she took should be the opposite of the one which is left in the hat. So since there were two white stones in the hat, it will be concluded in this way that she took a black stone. So princess Ikiani fortunately does not have to marry the mean grave Gwenn.