Level 21 - no previous mention of N selectors

[Facundo-Corradini]

Level 21 challenges to "Select all even plates", which should be answered with plate:nth-of-type(2n), but never before explains the use of N in nth selectors.

Also, it can be passed with a regular :nth-child(2n)

[DaTebe]

I think the idea is to use "even" as keyword in that function.

[dohavik]

It should be: plate:nth-of-type(2n+3)