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    A group of 30 people gather in a room. What is the probability that at least 2 of these people have the same birthday? The year of birth is not considered; having the same birthday means two peple were born on the same day of the year.

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    Solution. We consider one year has 365 days. Then there are 365*365*...*365=365^30 possible cases for these 30 people's birthdays since each of ...

    Solution Summary

    A group of 30 people gather in a room. What is the probability that at least 2 of these people have the same birthday? The year of birth is not considered; having the same birthday means two peple were born on the same day of the year.

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