how google rank domains

hi

i like to know how google give points for a like 

for example if google give 5 points for .com backlink then how much google will give points for .edu and .gov backlinks

--
You received this message because you are subscribed to the Google Groups "Google Search Engine Optimization SEO Google - MSN - Yahoo" group.
To view this discussion on the web visit https://groups.google.com/d/msg/seo1/-/sWPsySEmalIJ.
To post to this group, send email to seo1@googlegroups.com.
To unsubscribe from this group, send email to seo1+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/seo1?hl=en.