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Fibonacci number

using System; using System.Collections.Generic; using System.Linq; using System.Text; public class Utilities {     /// <summary>     ///      /// </summary>     /// <param name="x"></param>     /// <returns></returns>     public static int Fibonacci(int x)     {         if (x <= 1)             return 1;         return Fibonacci(x - 1) + Fibonacci(x - 2);     } }