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birthday problem

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birthday problem

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Also known as birthday paradox

mathematical problem

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Birthday paradox

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The computed probability of at least two people sharing the same birthday versus the number of people

In probability theory, the birthday problem asks for the probability that, in a set of n randomly chosen people, at least two will share the same birthday. The birthday paradox is the counterintuitive fact that only 23 people are needed for that probability to exceed 50%.

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