how to create a math game using random numbers in c#?

hey guys can u help me out finding the right why to solve this problem Finding a three-digit number or an additional close to it using 5 single-digit numbers, 1 two-digit (its multiples) and four operations . The closest number (/ -) may be 9 differences. All numbers will be generated randomly. It is not necessary to use all numbers for the number to be found . Ex: Finding the number 611 using the numbers 8, 6, 7, 7, 3, 60.8 3 = 1160 * 11 = 6607 * 7 = 49660-49 = 611

i tried to generate the random numbers so this what i came up with:

 class Program
    {
        static void Main(string[] args)
        {
            int[] singleDigit = new int[6];


            int twoDigit;
            int threeDigit;
            int answer = 0;
            string op;
            string op1 = "+";
            string op2 = "-";
            string op3 = "*";
            string op4 = "/";




            Random rand1 = new Random();

            for(int i=0; i<6; i++)
            {
                singleDigit[i] = rand1.Next(0, 10);
                Console.WriteLine(singleDigit[i]);
            }

            twoDigit = rand1.Next(9, 101);
            Console.WriteLine(twoDigit);
            threeDigit = rand1.Next(99, 1001);
            Console.WriteLine(threeDigit);

            var operator = { "+", "-", "*", "/"};
            var operator = getRandomOperator(); 

            while (answer != threeDigit)
            {


            }

    Console.ReadLine();
}

}