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Reflexivity is not for all elements of subset A. For example, relation R has not pair
Answer: 4. R is not an equivalence relation.
A strict partial order is transitive, antisymmetric (no ordered pair and its reverse in the relation), and irreflexive ( a binary relation R on a set A is called irreflexive if aRa does not hold for any a∈A).
So, (a, a) & (2, c) should be removed from R.
Answer: 4. (a, a) & (2, c)