alleryIf (a, b) in R always gives (b, a) in R, the relation is:
AReflexive
BTransitive
CUniversal
DSymmetric
Answer & Solution
Correct answer: D. Symmetric
1. Symmetry asks that a pair may be read either way round.
2. So (a, b) in R must force (b, a) into R as well.
3. The relation described is therefore symmetric.
_Source: syllabus Mathematics Part I, Chapter 1, Relations and Functions._
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