File:Birthday_Paradox.svg · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
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%.
Excerpted from Wikipedia’s “birthday problem” article, available under the CC BY-SA 4.0 licence.