How to select every 3rd Page

[prepressman_ntsf]

Hi,

I am attempting to select every third page by modifying a restriction (see below).

What I would like to do is select every third page, starting with the first page (Pages 1, 4, 7, 10, etc.). And what I did below doesn't appear to
be working.

To be clear, it is more of a restriction, as I want to make specific changes, but I only want it to occur on every third page. Is this possible?

[PPNINJA]

Select all
Select pages -nth pages
Try leaving the last area blank