Question: Which 3-tuples are in the relation {(a, b, c) |a, b and c, are positive integers with abc = 6}? The 4-tuples in a 4-ary

Which 3-tuples are in the relation {(a, b, c) |a, b and c, are positive integers with abc = 6}? The 4-tuples in a 4-ary relation represent these attributes of published books: title, ISBN, publication date, number of pages. What is a likely primary key for this relation

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