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If \(A=\{1,2,3\}\) and \(B=\{5,6,7\}\), which first component in \(R=\{(1,5),(2,6),(2,7),(3,5)\}\) violates the condition for a function?

Answer and explanation

Correct answer: 2

For a function, every element of the domain \(A\) must have exactly one image. Here, the first component \(2\) appears in \((2,6)\) and \((2,7)\), so it has two different images and violates the function condition. In contrast, \(1\) and \(3\) each have exactly one image. Exam tip: check the first components of the ordered pairs; a repeated first component with different second components indicates a violation.

Related tags

Relations And FunctionsFunction ConditionOrdered PairsMultiple ImagesDomain And CodomainFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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