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Digital Dice by Paul J. Nahin

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10. The Umbrella Quandary

Rain, rain, go away,Come again another day.

—popular children’s nursery rhyme

Imagine a man who walks every day between his home and his office. Because of the ever-present threat of rain, he likes to keep an umbrella at each location; that way, so goes his reasoning, if it is raining when he is about to leave one location to walk to the other, he won’t get wet. The only flaw in his grand plan is that if it isn’t raining he invariably neglects to take an umbrella with him. If you think about this for about five seconds, ...

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