In this tutorial learn how you can write a c program to evaluate the series S= 1+ 2×1 +3×2 +….+ nxn-1. where n is given by user.

We are using for loop for this tutorial.

C programming is a powerful general-purpose programming language. It can be used to develop software like operating systems, databases, compilers, etc.

Write a Program to Evaluate the Series S= 1+ 2×1 +3×2 +….+ nxn-1

Here is the code to evaluate the series S= 1+ 2×1 +3×2 +….+ nxn-1. where n is given by user. in C programming.

#include <stdio.h> //WAP to evaluate the series S= 1+ 2x1 +3x2 +….+ nxn-1. where n is given by user.
int main()
{
    int n, i, sum = 1;
    printf("Enter n terms for series:");
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
    {
        sum = sum + i * (i - 1);
    }
    printf("sum of the series is %d.", sum);

    return 0;
}

Test Live At Jdoodle

Conclusion

This is how you can evaluate the series S= 1+ 2×1 +3×2 +….+ nxn-1. where n is given by user. in c programming. Comment below if you like our tutorial.