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If \(f:\{0,1,2,3\}\to\{0,1,2,3\}\) is defined by \(f(x)\) as the remainder obtained when \(2x\) is divided by 4, what is the range of \(f\)?

Answer and explanation

Correct answer: \(\{0,2\}\)

For the domain values, \(f(0)=0\), \(f(1)=2\), \(f(2)=0\), and \(f(3)=2\), since these are the remainders when \(2x\) is divided by 4. Therefore, the set of attained values, or the range, is \(\{0,2\}\). The set \(\{0,1,2,3\}\) is the codomain, not the range. Exam tip: To find the range, evaluate the function for every domain element and list repeated outputs only once.

Related tags

Modulo FunctionRangeCodomainFinite FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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