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How can yahoo, google, and bing crawl the same website and index a different number of pages?
Each has its own search engine, and your filters filtering of information on the site.
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Search engines have their own algorithms which is a kind of formula that is used in evaluating a website’s quality for inclusion in the search list. That difference in the algorithm is the reason why the search results are not the same. Think if the search results of all search engines are practically the same, what do you think will happen to the industry of search engines?