Last Updated:2025/12/05

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.

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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.

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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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