Combination

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        /// <summary>
        /// https://groophy-inc.github.io/combination
        /// </summary>
        /// <param name="n"></param>
        /// <param name="k"></param>
        /// <returns></returns>
        public static GValue Combination(GValue n, GValue k)
        {
            GValue ret = Division(Factorial(n), Multiplication(Factorial(k), Factorial(Subtraction(n, k))));
            ret.get_String = (Factorial(n).ToString() + "/[" + Factorial(k).ToString() + ".("+Factorial(Subtraction(n, k).ToString()).ToString()+")] = " + ret.get_Decimal.ToString());
            return ret;
        }