## Problem Statement

given a positive integer n, write a JavaScript program to find the sum of first n natural numbers

## Solution

to find the sum of first n natural numbers using JavaScript, we can either use the formula `n(n + 1)/2`

, or iterate over a for loop from `1`

to `n`

and accumulate the sum

## Program

1. sum of first n natural numbers using formula

```
n = 10;
sum = n * (n + 1) / 2;
console.log(`sum of first ${n} natural numbers = ${sum}`);
```

in the above program, we have used arithmetic multiplication, arithmetic addition, arithmetic division

2. sum of first n natural numbers using for loop

```
n = 10;
sum = 0;
for ( let i = 1; i <= n; i++) {
sum += i;
}
console.log(`sum of first ${n} natural numbers = ${sum}`);
```