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Page A has 20 outward links to several other sites. One of this site has a page B linked two times by page A.
I'm wondering if the contribution of page A to the PageRank of page B is better than if page A would only have 1 link to page B?
Do not forget many pages have very nice graphical/educational images with "click-on-the-image" possibilities followed by a normal underlined textual link underneath. Or a logo linking home on the top left, with underneath the page the conventional "home" textual link.
On the voting effect, I would guess Google would either count the link as one or as 2/20 th.
Also do not forget the original Pagerank formula is many years old. Who says the dilution effect of the amount of links is linear?
The dilution effect could also be different from an index/home page compared with a regular internal page.