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Which of the following relations from \(A=\{1,2,3\}\) to \(B=\{a,b\}\) is not a function?

Answer and explanation

Correct answer: \(\{(1,a),(2,b)\}\)

For a relation to be a function, every element of the domain \(A\) must have exactly one image in \(B\). In option (D), no ordered pair is given with 3 as the first component, so the domain element \(3\) has no image. Hence, it is not a function. In options (A), (B), and (C), 1, 2, and 3 each occur exactly once as first components. Exam tip: To test a function, check that every domain element appears exactly once as the first component.

Related tags

Relations-And-FunctionsFunction-TestDomain-And-RangeOrdered-PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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