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program to Print Sum of factorial Series in C#
C# program to Print Sum of factorial Series
Program Statement:
Write a program to display the sum of the following series.
2/1! + 4/3! + 6/5! + 8/7! + 10/9! + . . . + n/(n-1)!
Solution:
public class factorial
{
int n;
public void ser()
{
double f, sum = 2, res = 1, up = 2;
Console.WriteLine("\n\t\tSeries = 2/1! + 4/3! + 6/5! + 8/7! + 10/9! + . . . + n/(n-1)!");
Console.WriteLine();
Console.Write("\n\t\tEnter ending point : ");
n = Convert.ToInt16(Console.ReadLine());
for (int i = 2; i <= n; i++)
{
if (i % 2 == 1)
{
f = 1;
for (int x = i; x > 0; x--)
{ f = f * x; }
up = up + 2;
res = up / f;
sum = sum + res;
}
}
Console.WriteLine("\n\t\tSum : {0}\n", sum);
Console.WriteLine();
}
}
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