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On A = {1, 2, 3, 4}, the relation R = {(a, b): a − b = 10} is which type?
AUniversal relation
BEmpty relation
CEquivalence relation
DReflexive relation
Answer & Solution
Correct answer: B. Empty relation
The largest possible difference in A is 3, so no pair satisfies a − b = 10 and R has no elements.
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