Help me in solving JS20D problem

help
,
1

My issue

i did as it mentioned in the question but still not working

My code

var removeelement = document.getElementById('paragraph3');
document.getElementById('primary').removeChild(removeelement);

document.getElementById('paragraph1').hidden = true;

Learning course: Web development using JavaScript
Problem Link: Delete or hide elements using DOM Practice Problem in Web development using JavaScript - CodeChef