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Let A= {p, q, r}. Which of the following...

Let `A= {p, q, r}`. Which of the following is an equivalence relation on `A`? (a) `R_1 = {(p, q), (q, r), (p, r), (p, q)}` (b) `R_2 = {(r,q), (r, p), (r.r), (q, r)}` (c) `R_3 = {(p, p), (q,q), (r, r), (p, q)}` (d) one of these

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The correct Answer is:
(i) Reflexive and transitive but not symmetric.
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