順列は組み合わせと違って、母集団から引く数字に順番があります。 例えば競馬の三連単では一位から三位を正確に当てる必要があり、順不同は許されません。 この時の確率を求める時にmath.permを使います。 math.perm(母集団の数, 引く数） で求められます。

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