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If \(A=\{1,2\}\), \(B=\{3,4\}\), and \(f=\{(1,3),(2,3)\}\), what is the range of \(f\)?

Answer and explanation

Correct answer: \(\{3\}\)

The range of a function is the set of all actual output values. In both ordered pairs, the second component is 3, so the range is \(\{3\}\); a set lists 3 only once. \(\{3,4\}\) is the codomain, not the range, because no element of \(A\) maps to 4. Exam tip: To find the range from ordered pairs, collect their second components.

Related tags

Relations And FunctionsRangeFunctionsMany-One MappingCodomainReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeMathematics

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