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use method prev() or next()
<!DOCTYPE html> <html lang="en"> <head> <title>Document</title> </head> <body> <h2>Student List</h2> <ul class="student-list"> <li>James McAvoy</li> <li>Alena Holligan</li> <li>Wade Christensen</li> <li>Matt Krzyzynski</li> </ul> <script src="jquery-3.2.1.min.js"></script> <script src="app.js"></script> </body> </html>
I haven't done the course but the code below worked for me. You don't need to pass .prev an argument of li as it is already being called on the list element. Hope this helps.
$( 'li' ).eq(2).prev().prev();