Which of the following relations is symmetric but neither reflexive nor transitive for a set A = 1, 2, 3.
Think of it like this: using formula we get R = (1, 2), (2, 1). Calculation gives this directly, check steps: apply rule, substitute values, simplify to get R = (1, 2), (2, 1).
Ref: NCERT Mathematics Class XII — Matrices and Determinants
