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N個中K個のくじが当たり 引いたら戻さない条件でn回引いたうちk個当たりである確率

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超幾何分布
http://ja.wikipedia.org/wiki/%E8%B6%85%E5%B9%BE%E4%BD%95%E5%88%86%E5%B8%83

超幾何分布とは K 個の成功状態をもつ N 個の要素よりなる母集団から n 個の要素を非復元抽出したときに k 個の成功状態が含まれている確率を与える離散確率分布の一種

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