using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Problem25

{

classProblem25

{

staticvoid Main(string[] args)

{

Console.WriteLine("\t\tName: Ehtesham Mehmood\n\t\tRoll No: 11014119-131\n\t\tSection: AE\n \t\t UOG\n");

int num;

int fact1=1;

int sum=0;

Console.WriteLine("Enter Number To Display The Sum Of The Following Series i.e. sum of the factorial of odd series\n Like This 1! + 3! + 5! + 7! + 9! + . . . + n!");

num = Convert.ToInt32(Console.ReadLine());

for (int i = 1; i <= num; i++)

{

if (i % 2 != 0)

{

fact1 = 1;

for (int j = 1; j <= i; j++)

{

fact1 = fact1 * j;

}

sum = sum + fact1;

}

}

Console.WriteLine("\nThe Sum Of The Following Series: " + sum);

Console.ReadKey();

}

}

}

Output: