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RecursionMystery648

Language/Type: C# recursion

Given the method below, what is the output of the following call? (What is the method really doing?)

public static int Mystery(int n)
{
    if (n < 10)
    {
        return n;
    }
    else
    {
        int a = n / 10;
        int b = n % 10;
        return Mystery(a + b);
    }
}
Mystery(648);
(order shuffled)

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