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Brother and sister is given as an example of a:
ARotation
BReduction
CReflection
DRelation
Answer & Solution
Correct answer: D. Relation
1. Everyday pairings motivate the idea.
2. Father and son is given alongside it.
3. Patterns such as brother and sister characterise relations.
4. So the answer is a relation.
_Source: NCERT Class XI Mathematics, Ch 2 'Relations and Functions'_
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