public static void Main()
double[] terminos = new double [6];
for (int i=0;i<terminos.Length;i++)
terminos[i]= Math.Pow(3,i);
prom=suma/terminos.Length;
foreach (int valor in terminos)
Console.Write("{0} \t", valor);
Console.WriteLine("\n\nSuma: {0:###.00}", suma);
Console.WriteLine("Promedio: {0:###.00}", prom);