What is the probability that from 23 at least people 2 people have their birthday on the same day. Assume that the year has 365 days and that all the birthday combinations have the same probability.
Can anyone solve this?
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This is a very famous probability problem. It's easiest to determine the complementary probability: no matches among 23 people. – paw88789 Sep 02 '15 at 14:46
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1I have gotten that long but I am uncertain how to proceed¨ – DoubleOseven Sep 02 '15 at 14:48
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1It is well known: https://en.wikipedia.org/wiki/Birthday_problem – uniquesolution Sep 02 '15 at 14:52
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Thank you! I will check it out – DoubleOseven Sep 02 '15 at 15:07
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It is also known under "birthday-paradox" because it is surprising at first sight that the probability is already exceeding $0.5$. – Peter Sep 02 '15 at 19:21