Sum of Series||C language||programming_info ||Series problem 8

Calculate the sum of series

2,6,12,20,30,...,n

Solution using C language:

#include <stdio.h>

int main() {

   int n;

   printf("Enter the range\n");

   scanf("%d",&n);

   int sum = ((n*(n+1))/2)+((n*(n+1)*(2*n+1))/6);

   printf("the sum of series till %d is %d", n,sum);

   return 0;

}

Output:

Enter the range

3

the sum of  series till 3 is 20

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