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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Sum of First N Natural Numbers</title> </head> <body> <h3>Javascript Calculate Sum of the First N Natural Numbers</h3> <script> document.addEventListener('DOMContentLoaded', function() { function sumOfFirstNNumbersFormula(n) { return (n * (n + 1)) / 2; } const n = 12; // You can replace 5 with any positive integer const result = sumOfFirstNNumbersFormula(n); // Create a paragraph element to display the result const resultParagraph = document.createElement('p'); resultParagraph.textContent = `The sum of the first ${n} natural numbers is: ${result}`; // Append the paragraph to the body of the document document.body.appendChild(resultParagraph); }); </script> </body> </html>