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If A = {1, 2, 3} and R = {(1, 2), (2, 3)} is a relation, why is R not a function from A to A?

Answer and explanation

Correct answer: Because 3 has no image

For a relation to be a function, every element of the domain A must have exactly one image. Here, 1 maps to 2 and 2 maps to 3, but 3 has no image. Therefore, R is not a function from A to A. Option B is incorrect because 1 has only one image, namely 2. Exam tip: To test a function, check that every domain element appears exactly once as the first component of an ordered pair.

Related tags

RelationsFunctionsDomainCodomainOrdered-PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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