CSS nth-child: every 3rd element starting from the 4th

Question

I'm trying to select every 3rd section tag but starting from the fourth. So the bold elements below would indicate those that I would like to select:

1. section
2. section
3. section
4. section
5. section
6. section
7. section
8. section
9. section

I've tried the following code but it doesn't appear to be working

section:nth-child(3n+1)

Answer 1

If you want to start from the 4th element use +4 not +1

section:nth-child(3n+4) {
  color: red;
}

<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>
<section>Section</section>