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Answer and explanation please .

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Relation r contains 1000 tuples, values of A among the tuples are uniformly distributed, it means each number has the same probability of being inserted.

range is 1 to 500, there are 1000 records means one element will be at least two times, So for the condition A<=200 there should be 400 records at least fetched.
Hence answer is (d) 400
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