Question

Write a program in C programming language that print the following sum of series 1+4+7+10………+N

Answer 1

#include<conio.h>
#include<stdio.h>
#include<stdlib.h>




int main(){
	int sum=0;
	int n,i;
	printf("Enter n: ");
	scanf("%d",&n);


	for(i=1;i<=n;i+=3){
		sum+=i;
	}
	printf("Sum: %d\n\n",sum);






	scanf("%f",&i);
	return 0;
}