1.

Let R be a relation on the set of ordered pairs of positive integers such that ((p, q), (r, s)) ∈ R if and only if p – s = q – r. Which one of the following is true about R?

A. Both reflexive and symmetric
B. Reflexive but not symmetric
C. Not reflexive but symmetric
D. Neither reflexive nor symmetric
Answer» D. Neither reflexive nor symmetric


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