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Digital Dice by Paul J. Nahin

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6. Steve’s Elevator problem

Much drinking, little thinking.(So, no opium-smoking or boozing if you want to solve this problem!)

In March 2004 I received the following e-mail from a California reader of my first probability book, Duelling Idiots. That reader, Mr. Steve Saiz, wrote to ask for some help with an elevator problem different from the one in the last problem:

 

Every day I ride up to the 15th floor in an elevator. This elevator only goes to floors G, 2, 8, 9, 10, 11, 12, 13, 14, 15, 16, and 17. On average, I noticed that I usually make ...

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