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4. Suppose that there's a total of 50 data mining related documents in a library of 200 documents. Suppose that a search engine retrieves 10

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4. Suppose that there's a total of 50 data mining related documents in a library of 200 documents. Suppose that a search engine retrieves 10 documents after a user enters 'data mining' as a query, of which 5 are data mining related documents. What are the precision and recall

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