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#include<stdio.h>

int main(void)

{

         int i,n,sum;

 

         printf("Enter n:");

         scanf("%d",&n);

         sum=0;

         for(i=1;i<=n;i++){

                   sum=sum+i;

         }

         printf("Sum of numbers from l to %d is %d\n",n,sum);

 

         return 0;

}