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順列→並べ替えが必要なもの。
組合せ→並べ替えが必要でないもの。ただ選ぶだけのもの。
例えば、3個のさいころを同時に振って出た目は何通り？は組合せ、同時に振って出た目で3桁の数字を作る(=並び替えが必要)は順列です。
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