can anybody know the relationship of pagerank and backlink? how many backlink can give pr4 or higher?
It is said that 1-2 PR5 links should be enough to get your PR4. The exact quantitative relation would probably known only by google bots
Nobody could say that. It's not that important either. Just keep building links from quality and if possible - related sites and you will do well in Google.
It is all speculation, google has never officially said what the criteria is. Also, they are often changing their algorithm so what may work today won't tomorrow. Best bet is to build backlinks, preferably from authority sites in your niche.
can not get any PR by getting 1 or 2 BL from any high ranked PR sites. has to get many from many diff ip sites and also will take little time too to add PR on any new site