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    (1) In your sock drawer you have 10 red socks and 10 white socks. They are not paired together. You wake up in the dark room and need a pair of socks. What is the maximum number of times you'll have to reach in and pull out one sock at a time until you know you have a matching pair?

    (2) I'm giving you one 9 quart bucket and one 4 quart bucket.  I want you to go to the river and bring me back exactly 6 quarts of water.  You can only make one trip and you have no way to measure or put any kind of a mark on the sides of either bucket.  How do you do it?

    (3) What has rivers but no water, forests but no trees, and cities but no people?

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