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モンティ・ホール問題

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Last updated at Posted at 2025-07-02

wikiなどに書いてある解説がわかりにくい。

プレイヤーは最初の段階で、3つのドアを「ドア1つだけの集合A、ドア2つの集合B」への組分けを指定することができると考えれば良い。次の司会者の作業のとき(ハズレを開けて見せてくれるとき)にはプレイヤーは目を閉じておくことにする。最後にプレイヤーはAかBを選ぶことができる。集合Bをえらべば確率は2/3である。

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