If you think that having higher number of pages give you a better chance to rank on Google, this might not be the case. Matt Cutts has recently released a Webmaster video explaining that it is the number of links and PageRank that might contribute to high ranking, when you have a website with large number of pages.
The question asked to Cutts was:
“Does a website get a better overall ranking if it has a large amount of indexed pages”?
Cutts said that just because you have a large number of index pages, you will not automatically get high ranking. However, if you have more pages that have different keywords on them, you have the opportunity that they might be able to rank for individual queries.
Typically, if a site does have more pages, it might mean it has more links pointing to it. Which means, it has a higher PageRank. If that's the case, Google might crawl a little bit deeper into the website. And if it has higher PageRank, Google might think that it is a little bit of a better match for users query.
Just having a big website with lot of pages doesn't automatically confer boost. But, if you have a lot of links or page rank, which is leading to deeper crawling within your site that might be sort of indicator that perhaps your site would rank just a little bit higher. Again, just having a number of pages doesn’t give you a boost though it might give you more opportunities. But normally, the only reason you get that opportunity is because Google sees more links to your website, so it will crawl a little bit deeper to find more pages to index.Large Number of Index Pages Doesn't Give Higher Ranking - Matt Cutts!,