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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: ( Back to comment list | You must be logged in to post comments.)
re(5): thoughts | Comment 8 of 12 |
(In reply to re(4): thoughts by Leming)

I was actually questioning Bob's requirement that the last two match rather than any match, with 10th and 15th being an example.


  Posted by Charlie on 2006-06-09 16:55:49
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