The birthday paradox is “How many people can you get together and the probability that two (or more) of them have the same birthday exceeds 50%? The question is: “How many people can you get together to exceed 50%? Only 23 people are needed to exceed 50%. [Birthday paradox - Wikipedia https://ja.wikipedia.org/wiki/%E8%AA%95%E7%94%9F%E6%97%A5%E3%81%AE%E3%83%91%E3%83%A9%E3%83%89%E3%83%83%E3%82% AF%E3%82%B9]
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