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 Happy Birthday (3) (Posted on 2006-06-09)
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)

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 re(3): thoughts | Comment 5 of 12 |
(In reply to re(2): thoughts by Bob Smith)

Why is it that it is the nth person that shares a birthday with someone else?  Why not for example, the 10th person out of 30 matches the 15th out of the 30 people?
 Posted by Charlie on 2006-06-09 14:57:45

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