File:Birthday_Paradox.svg · Wikimedia Commons · See Wikimedia Commons
birthday problem
Also known as birthday paradox
mathematical problem
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Article
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%.