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出典:Wiktionary

birthday problem

出典:『Wiktionary』 (2025/05/16 13:54 UTC )

名詞

birthday problem

  1. (probability theory) The mathematics problem that concerns the probability there exist two people in a random group who share a birthday.

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ウィキペディア英語版

出典:Wikipedia

Birthday problem

出典:『Wikipedia』 (2011/06/09 21:07 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

In probability theory, the birthday problem or birthday paradox pertains to the probability that in a set of randomly chosen people some pair of them will have the same birthday. By the pigeonhole principle, the probability reaches 100% when the number of people reaches 366 (excluding February 29 births). But perhaps counter-intuitively, 99% probability is reached with just 57 people, and 50% probability with 23 people. These conclusions are based on the assumption that each day of the year (except February 29) is equally probable for a birthday.

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