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 Birthday Line (Posted on 2004-03-29)
At a movie theater, the manager announces that they will give a free ticket to the first person in line whose birthday is the same as someone 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, that birthdays are distributed randomly throughout the year, etc., what position in line gives you the greatest chance of being the first duplicate birthday?

from http://www.ocf.berkeley.edu/~wwu/riddles/hard.shtml

 See The Solution Submitted by Victor Zapana Rating: 3.5556 (9 votes)

 Subject Author Date Answer K Sengupta 2008-03-18 10:36:19 Solution Dej Mar 2008-03-18 04:45:15 Solution Ruopeng Wang 2004-06-10 23:06:58 hmmmmm Devin 2004-04-16 10:27:38 re(2): Function Tristan 2004-04-04 18:06:38 re: Function Richard 2004-04-03 21:31:07 re(4): Function [with observations] Richard 2004-04-03 14:53:00 re(3): Function [with observations] Jer 2004-04-02 14:32:18 re(2): Function [with observations] Richard 2004-03-31 17:19:55 re: Random Guess Jer 2004-03-31 12:19:22 re: Function [with observations] Jer 2004-03-31 12:16:10 Random Guess Barrett Hasseldine 2004-03-30 22:50:19 Function Tristan 2004-03-30 19:04:08 re: No Subject Charlie 2004-03-30 08:37:50 No Subject hunter 2004-03-30 06:23:29 totally wrong [re: No Subject] TomM 2004-03-30 05:38:20 No Subject Matt 2004-03-29 22:21:31 solution (method of solving for Ryan) Thalamus 2004-03-29 13:49:47 re(2): solution - it is right SilverKnight 2004-03-29 13:46:28 re: solution - not right Ryan 2004-03-29 13:43:00 solution Thalamus 2004-03-29 13:36:54

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