Tuesday, February 15, 2011

Free Tickets

At a movie theater, the manager announces that a free ticket will be given to the first person in line whose birthday is the same as someone in line who has already bought a ticket. You have the option of getting in line at any time. Assuming that you don't know anyone else's birthday, and that birthdays are uniformly distributed throughout a 365 day year, what position in line gives you the best chance of being the first duplicate birthday?


  1. First in line. You'll get 1 ticket and another free :)

  2. agree with kyle.. buy a ticket then be in the first of the line.. makes you the first person to match your own birthday (which in logic terms is always true)

  3. But are you still in line after you've already bought your ticket?

  4. You should Be the 20th in line

  5. My experience with classes is that 22 is the 'trip' number that seems to be the number that is needed to have a match.


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