Structural Pseudo-classes Code Challenge Question #3

Im going through just fine and here is my code for each of the first 3 questions. On the (-n+4) part, when I put that in, it tells me that "It looks like Task #1 is no longer passing" ?? But if I change it to something else like (n+4) it just tells me I need to check my selector!

omg what am I doing wrong? To me these selectors are getting crazy hard to remember all of them and no matter what Im going to have to review these before I ever put them in a site lol

li:nth-child(even) { color:white; background-color: #000; }

li:nth-child(3n) { color:white; background-color: #FF6347; }

li:nth-child(-n+4) { color:white; background-color: #FF6347; font-weight:bold; }