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Let \(R=\{(1,a),(2,b),(3,a)\}\) be a relation from \(A=\{1,2,3\}\) to \(B=\{a,b,c\}\). Which of the following statements is correct?

Answer and explanation

Correct answer: \(R\) is a function from \(A\) to \(B\), but it is not onto.

Each element of \(A\)—1, 2 and 3—has exactly one image, namely \(a,b,a\), so \(R\) is a function. However, \(c\) has no preimage, so it is not onto. Exam tip: first check that every input has exactly one output; repeated outputs are allowed.

Related tags

Relations And FunctionsFunctionOnto FunctionOne-One FunctionDomain And CodomainClass 11 MathematicsFunctions As A Special Kind Of RelationMathematics

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