title: How to find det of matrix 3x3 in c#
body: <p>I'm able to find det of matrix 2x2 using this code:</p>
  
  <pre><code>using System;
  
  class find_det
  {
  static void Main()
  {
      int[,] x = { { 3, 5, }, { 5, 6 }, { 7, 8 } };
      int det_of_x = x[0, 0] * x[1, 0] * x[0, 1] * x[1, 1];
      Console.WriteLine(det_of_x);
      Console.ReadLine();
  }
  }
  </code></pre>
  
  <p>But when I tried to find det of 3x3 Matrix, using this code:</p>
  
  <pre><code>using System;
  
  class matrix3x3
  {
      static void Main()
  {
      int[,,] x={{3,4,5},{3,5,6},{5,4,3}};
      int det_of_x=x[0,0]*x[0,1]*x[0,2]*x[1,0]*x[1,1]*x[1,2]*x[2,0]*x[2,1]*x[2,2];
      Console.WriteLine(det_of_x);
      Console.ReadLine();
      }
  }
  </code></pre>
  
  <p>It got error. Why?</p>