Also links from pages that are not in the Google index can pass PageRank to other pages and websites. This is important especially when pages are marked with "noindex, follow".
Many websites contain pages that their webmaster doesn't want to be indexed - e.g. imprint, terms and conditions and so on. In order to prevent a page from being indexed, the best thing is to use the robots meta attribute "noindex".
But what about the links on those pages? Google recognizes and follows them (if not unfollowed by robots directive, robots.txt or individually) while crawling. The question is if these links can pass PageRank despite the "noindex". The short answer is "Yes". This was confirmed by John Mueller on Twitter this week:
He adds: "follow" is a default setting and does not have to be specified additionally.