**C# Program to print sum of the factorial of odd series multiply with x where power of x is square of corresponding number**

**Program Statement:**

Write a program to display the sum of the following series i.e. sum of the factorial of odd series multiply with x where power of x is square of corresponding number.

X1*1! + X9*3! + X25*5! + X49*7! + X81*9! + . . . + Xn2*n!

**Solution:**

class _power { long n, f, x, sum = 0; public long power(long a, long b) { long res = 1; for (int i = 1; i <= b; i++) res = res * a; return res; } public void cal() { Console.WriteLine("\n\t\tSeries X^1*1! + X^9*3 +...+X^n2*n! \n"); Console.Write("\n\t\tEnter value of x : "); x = Convert.ToInt32(Console.ReadLine()); Console.Write("\n\t\tEnter ending point : "); n = Convert.ToInt32(Console.ReadLine()); for (int i = 1; i <= n; i++) { if (i % 2 != 0) { f = 1; for (int j = i; j >= 1; j--) f = f * j; sum = sum + ((power(x, i * i)) * f); } } Console.WriteLine("\n\t\tResult = {0}\n", sum); } }

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