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A relation involves pairs of objects in a certain:

AOrder
BOrigin
COutline
DOpening
Answer & Solution
Correct answer: A. Order
1. Pairs alone are not enough for a relation. 2. Which element comes first matters. 3. A relation involves pairs of objects in certain order. 4. So the answer is order. _Source: syllabus Mathematics, Ch 2 'Relations and Functions'_
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