Information retrieval | Computer Science homework help

  (1)An information retrieval system has a certain pair of average precision and recall values when the system returns 10 documents in response queries. Would the precision and recall rate remain unchanged if the system were modified to return 20 documents in response to queries? Explain your answer. (b) A system retrieves 20 documents with precision being 80% and recall being 50% for a given query. What is the number of relevant documents that are not retrieved by the system?  

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