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5. a. A set of attributes X is said to be closed if X*=X. In the relation R(ABCD) with no functional dependencies, how many closed

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5. a. A set of attributes X is said to be closed if X*=X. In the relation R(ABCD) with no functional dependencies, how many closed sets of attributes are there? 12 b. 15 10 c. d. 7 e. 5 f. none

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