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What is the probability in a room of 20 people that at least 2 people have the same birthday?

What is the probability in a room of 20 people that at least 2 people have the same birthday?
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What is the probability in a room of 20 people that at least 2 people have the same birthday?

User Susannah
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1 Answer

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the probability is 100(1-e^(-x^2/(2*365))
for 20 people it is about 42 percent
User Sebastian Dwornik
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