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Happy Birthday (3) (Posted on 2006-06-09) Difficulty: 3 of 5
In Happy Birthday, the question was if there are N people in a room, what is the probability that there are at least two people in the room who share a birthday?

What if instead exactly two was required? If there are N people in a room, what is the probability that there are exactly two people in the room who share a birthday?

(Note: Assume leap year doesn't exist, and the birthdays are randomly distributed throughout the year.)

No Solution Yet Submitted by Sir Percivale    
Rating: 4.0000 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(2): thoughtsfaye2006-06-15 21:20:09
re(5): thoughtsBob Smith2006-06-12 09:12:34
re(4): thoughtsBob Smith2006-06-12 07:59:24
re(3): thoughtsCharlie2006-06-09 17:03:43
re(5): thoughtsCharlie2006-06-09 16:55:49
re: solution -- simulation of 20,000 trials of n=19Charlie2006-06-09 16:53:44
Questionre(4): thoughtsLeming2006-06-09 16:50:10
re(3): thoughtsCharlie2006-06-09 14:57:45
re(2): thoughtsBob Smith2006-06-09 13:43:27
SolutionsolutionCharlie2006-06-09 11:50:07
Solutionre: thoughtsRobby Goetschalckx2006-06-09 08:02:39
SolutionthoughtsBob Smith2006-06-09 07:38:11
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