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If \(f:A\to B\) is a function where \(A=\{1,2,3\}\), \(B=\{a,b,c,d\}\), and \(f=\{(1,a),(2,b),(3,b)\}\), what is the range of \(f\)?

Answer and explanation

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

The range of a function is the set of all actual output values, כלומר the second components of its ordered pairs. Here, \(1\mapsto a\), \(2\mapsto b\), and \(3\mapsto b\), so the range is \(\{a,b\}\). The set \(\{a,b,c,d\}\) is the codomain, but \(c\) and \(d\) are not attained by the function. Exam tip: To find the range, collect the second components of all ordered pairs and list repeated values only once.

Related tags

Range-CodomainFunctionsOrdered-PairsClass11Real Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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