I believe that "number of results" which is returned by Google for each query isn't correct. For example: the results of three following queries must be the same. (The result represents number of all pages which is indexed by Google and thus must be unique) (inurl:w | -inurl:w) number of results: 15,440,000,000 (inurl:a | -inurl:a) number of results: 11,910,000,000 (inurl:0 | -inurl:0) number of results: 16,000,000,000 As you can see there is difference between results. And also I want to know is there any way to find out how many pages and files were indexed by google? Another example: suppose the following queries: site:com number of results: 4,700,000,000 site:net number of results: 348,000,000 (site:com | site:net) number of results: 4,320,000,000 The number of results for third query must be equal sum of the number of results for two other queries (number of results for third query = number of results for first query + number of results for second query) but unfortunately it's not. Please just say me what's wrong? Any help would be appreciated.
IMO, the number of results displayed by Google is just an approximation of the number of web page/ web site that includes the specific term being searched in the query...If you check all the results, you'll find out that the actual no. of pages displayed didn't match the number of results maybe because it only shows the most relevant pages for a searched term..