Sum of Series||C language||programming_info ||Series problem 12

To calculate sum of the first N terms of the series:

2,22,222,......

Solution using C language:

#include <stdio.h>

#include <math.h>

int main() {

   int n ;

   printf("Enter the range\n");

   scanf("%d",&n);

   float sum = 2*(pow(10, n) - 1 - (9 * n))/81;

   printf("sum is %d", sum);

   return 0;

}

Output:

Enter the range

3

sum is 879

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