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c# calculate combinations

alws34 on Nov 24, 2020

public static class PermutationsAndCombinations
{
    public static long nCr(int n, int r)
    {
        // naive: return Factorial(n) / (Factorial(r) * Factorial(n - r));
        return nPr(n, r) / Factorial(r);
    }

    public static long nPr(int n, int r)
    {
        // naive: return Factorial(n) / Factorial(n - r);
        return FactorialDivision(n, n - r);
    }

    private static long FactorialDivision(int topFactorial, int divisorFactorial)
    {
        long result = 1;
        for (int i = topFactorial; i > divisorFactorial; i--)
            result *= i;
        return result;
    }

    private static long Factorial(int i)
    {
        if (i <= 1)
            return 1;
        return i * Factorial(i - 1);
    }
}

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"c# calculate combinations" Code Answer's