The relation R in set {1, 2, 3} given by R = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 3)} is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Reflexive only
Reflexive: (1, 1), (2, 2), (3, 3) are all in R. Yes.
Symmetric: (1, 2) ∈ R but (2, 1) ∉ R. No.
Transitive: (1, 2) ∈ R and (2, 3) ∈ R, but (1, 3) ∉ R. No.
So R is reflexive only, and not an equivalence relation.
NCERT (2026-27 edition):
Types of Relations
