the relation R in the set {1,2,3} given by R = {(1,1), (2,2), (3,3), (1,2), (2,3)} is-

Reflexive Symmetric Transitive None of these

Reflexive

The given relation R = {(1,1), (2,2), (3,3), (1,2), (2,3)} is reflexive since (1,1), (2,2) and (3,3) lie in R. R is not symmetric, as (1,2)∈R bur (2,1) ∉ R. Similarly, R is not transitive, as (1,2)∈R and (2,3) ∈R but (1,3) ∉ R.