Assume there are 100 documents in the collection, 20
documents contain the term apple(fruit), 20 documents contain the term apple(company),
and 20 documents contain the term iPad. And there is no document contains apple and
iPad at the same time. One user searches the term apple (company). The iPad is
a product of Apple company, so the 20 documents containing term ipad are
relevant to the query and S equals to 40 and s equals to 20, right?
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