Last Updated：2025/12/05

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(probability theory) The counterintuitive observation that a random group of people needs to have only 23 members before there is a 50% chance of two of them having the same birthday.

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birthday paradox

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Source Word

birthday paradox

Noun

(probability theory) The counterintuitive observation that a random group of people needs to have only 23 members before there is a 50% chance of two of them having the same birthday.

Japanese Meaning

無作為に選ばれた集団において、23人ほどで50%以上の確率で誰かの誕生日が重なるという、直感に反する統計学の現象

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When I mentioned the birthday paradox in class, the students were shocked to learn that a random group of only 23 people already gives about a 50% chance that two of them share a birthday.

Google Translation / DeepL Translation

授業で誕生日のパラドックス、つまり無作為に集めたわずか23人のグループでも2人が同じ誕生日である確率が約50％になるという直感に反する事実を説明したとき、学生たちは驚きました。

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(probability theory) The counterintuitive observation that a random group of people needs to have only 23 members before there is a 50% chance of two of them having the same birthday.

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birthday paradox

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