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Que. 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:Not reflexive but symmetric
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