On {1, 2, 3}, R = {(1, 1), (2, 2), (3, 3), (1, 2)}. Choose the correct option.
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Answer: B. R is reflexive and transitive but not symmetric
All (a, a) are present; every chain such as (1,2), (2,2) gives a pair already in R; but (2,1) ∉ R.