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    Question

    A is the only candidate key. Then how many superkey possible with R(A,S,C,D)

    A 4 Correct Answer Incorrect Answer
    B 8 Correct Answer Incorrect Answer
    C 16 Correct Answer Incorrect Answer
    D 32 Correct Answer Incorrect Answer
    E 2 Correct Answer Incorrect Answer

    Solution

    A has to be taken for every case so we have 2 choices to take b,c ,d each or not so 2*2*2=8  

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