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Which of the following is NOT sufficient to imply that a subset of a metric space is open?

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Which of the following is NOT sufficient to imply that a subset<br><img src='https://www.fatskills.com/images2/GradExams/474FA710-8F74-4495-96FE-0267E48C187D.png' height='15' width='14'/> of a metric space<br><img src='https://www.fatskills.com/images2/GradExams/E9C3211F-107A-4A6B-86D3-469D5FF75EBE.png' height='14' width='20'/> is open?






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