Hi All,

Suppose a randomly selected group of people are brought together. What is the probability that exactly one pair has the same birthday?

The solution is

But I'm can't see exactly why this is so. Any help much appreciated. MD

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- Dec 19th 2011, 12:25 AMMathsdogVariation on the birthday problem
Hi All,

Suppose a randomly selected group of people are brought together. What is the probability that exactly one pair has the same birthday?

The solution is

But I'm can't see exactly why this is so. Any help much appreciated. MD