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

Answer and explanation

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

The domain of a function is the set of first components of all its ordered pairs. The first components here are \(a,b,c,d\), so \(A=\{a,b,c,d\}\). Option B is only the range, option C is the complete set of ordered pairs, and option D incorrectly combines domain and range elements. Exam tip: identify first components for the domain and second components for the range.

Related tags

DomainRangeFunctionsRelationsOrdered PairsClass 11Real Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And Range

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