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UPSC NDA II 2015 Mathematics Solved Paper

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Question : 1

Total: 120

Let X be the set of all persons living in Delhi.The persons a and b i X are said to be related if the difference in their ages is at most 5 years.The relation is

an equivalence relation
reflexive and transitive but not symmetric
symmetric and transitive but not reflexive
reflexive and symmetric but not transitive

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