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If A = {1,2,3} and R = {(1,2),(2,3)}, which element is in the domain of R but not in its range?

Answer and explanation

Correct answer: 1

The governing concept is the distinction between domain and range. The domain of a relation is the set of first coordinates, while its range is the set of second coordinates. From R = {(1,2),(2,3)}, the domain is {1,2} and the range is {2,3}. Comparing these sets, 1 occurs in the domain but not in the range. The element 2 belongs to both sets, and 3 belongs only to the range. Therefore option A is correct. Option B fails because 2 is common to domain and range, option C reverses the requested relationship because 3 is not in the domain, and option D is incorrect because the difference between the two sets is not empty; it is {1}.

Related tags

DomainRangeSet DifferenceReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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