Assuming that all years have 365 days and all birthdays

Chapter 9, Problem 32E

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Problem 32E

Assuming that all years have 365 days and all birthdays occur with equal probability, how large must n be so that in any randomly chosen group of n people, the probability that two or more have the same birthday is at least 1/2? (This is called the birthday problem. Many people find the answer surprising.)

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