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A summer reading list contains 12 works of fiction and 8 works of non-fiction. Each student is required tochoose4books,including atleast1 non-fictionbook,to read overtheholidays. Alansaysthatthenumberofdifferentgroupsof4bookscontainingat least1

  1. A summer reading list contains 12 works of fiction and 8 works of non-fiction. Each student is required tochoose4books,including atleast1 non-fictionbook,to read overtheholidays. Alansaysthatthenumberofdifferentgroupsof4bookscontainingat least1 non-fictionbookcanbedeterminedbyevaluating:

20C4-12C4

ExplainwhyAlan'ssolution istrue.

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