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<!DOCTYPE html> <html> <body> <p>Click the button to display the formatted numbers.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var num = 15; var a = num.toString(); var b = num.toString(2); var c = num.toString(8); var d = num.toString(16); var n = a + "<br>" + b + "<br>" + c + "<br>" + d; document.getElementById("demo").innerHTML=n; } </script> </body> </html>