Numbers programs
1. Write a program to find the sum of natural numbers? function addUpToNumber(n) { var total = 0; for(let i = 1; i <= n; i++) { total = total + i; } return total; } addUpToNumber(4); 2. Write a program to find the sum of natural numbers without loop? function addUpToNumber(n) { return n * (n+1)/2 } addUpToNumber(4); 3. Write a program to find the sum of even numbers? function sumOfFirstEvenNumbers(n) { return n * (n+1) } sumOfFirstEvenNumbers (4); 4. Write a program to find the sum of even numbers in a range? function sumOfEvenNumbersBetweenRange(i, n) { var result = 0; for (let index = i; index <= n; index++) { if(index % 2 == 0) { result = result + index; console.log(result); ...