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A relation R on a set S, defined as x R y if and only if y R x. This is an example of?

(a) reflexive relation

(b) symmetric relation

(c) transitive relation

(d) invalid relation

I want to ask this question from Trees in section Trees of Data Structures & Algorithms I

This question was posed to me in homework.

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Right answer is (b) symmetric relation

Explanation: A symmetric property in an equivalence relation is defined as x R y if and only y R x.

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