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UPSC NDA I 2014 Mathematics Paper

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Question : 1

Total: 120

Let X be the set of all citizens of India. Elements x, y in X are said to be related if the difference of their age is 5 years. Which one of the following is correct?

The relation is an equivalence relation on X.
The relation is symmetric but neither reflexive nor transitive.
The relation is reflexive but neither symmetric nor transitive.
None of the above

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