There are multiple settings in PDF-Tools that feature Pages Range options:
Figure 1. Page Range Options
•Select the All option button in include all document pages.
•The Current Page and Selected Pages options are not currently available.
•Select the Pages option button to select specified pages. Please note:
•Use commas to separate individual pages.
•Use hyphens to determine page ranges.
•Use commas to separate page ranges if multiple page ranges are defined.
•Use a dash before a page number to determine all pages from the beginning of the document to the specified page. For example -7 defines all pages from the beginning of the document to page seven.
•Use a dash after a page number to determine all pages from the specified page to the end of the document. For example 7- defines all pages from page seven to the end of the document.
•Use the Subset menu to select subsets as desired. The options are All Pages, Odd Pages Only and Even Pages Only.