Verified Answer :

Answer: 5x9=45

Step-by-step explanation:

tonb

Answer:

00009 = 0000

10989 = 9801

Step-by-step explanation:

I brute forced this...

   public static void Main()

   {

       for (int a = 0; a <= 9; a++)

       for (int b = 0; b <= 9; b++)

       for (int c = 0; c <= 9; c++)

       for (int d = 0; d <= 9; d++)

       {

           if ((9 (a 1000 + b 100 + c 10 + d)) == d 1000 + c 100 + b * 10 + a)

           {

               Console.WriteLine($"{a}{b}{c}{d}");

           }

       }

   }

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