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Digital Dice by Paul J. Nahin

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6. Steve’s Elevator Problem

For the k = 2 analysis (the riders at floor G are Steve and two others), we can write

  • there is one stop for Steve if

 

a. both of the other riders get off on Steve’s floor (probability = image), or

b. one of the other riders (either one) gets off on Steve’s floor and the other gets off on a floor above Steve’s (probability = ), or

c. both of the other riders get off on a floor above Steve’s (probability = );

 

  • there are ...

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