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If A = {1, 2, 3} and B = {a, b, c}, which option is not a function because one domain element is missing?

Answer and explanation

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

A function from A to B must assign exactly one image in B to every member of A. Since A = {1, 2, 3}, the first components must include 1, 2, and 3, with each appearing once. Option A contains pairs for 1 and 2 only; element 3 has no image. Thus option A is not a function from A to B. Option B assigns one image to each domain element, and option D does the same. Option C is also a function even though several inputs have the same image, because a function may be many-to-one. Therefore, the missing-domain-element condition makes A the unique correct answer.

Related tags

Relations-FunctionsMissing-ImageFunction-TestFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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