alleryThe set of all first elements is called the:
ADuration
BDomain
CDiagram
DDivisor
Answer & Solution
Correct answer: B. Domain
1. A relation is a set of ordered pairs.
2. Collecting the first entries gives one named set.
3. The set of all first elements of the ordered pairs is called the domain.
4. So the answer is the domain.
_Source: syllabus Mathematics, Ch 2 'Relations and Functions'_
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