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If (A={a,b,c}), (B={1,2}), and (f(a)=1), (f(b)=2), (f(c)=2), what is the range of (f)?

Answer and explanation

Correct answer: \({1,2}\)

The direct answer is C: the range is \(\{1,2\}\). The range means the set of output values that the function actually produces; it is not automatically the whole codomain. We are told \(f(a)=1\), \(f(b)=2\), and \(f(c)=2\). Collect the distinct outputs: 1 and 2. Thus \(\operatorname{Range}(f)=\{1,2\}\), even though 2 occurs twice in the mapping. Option A is incomplete because it leaves out the output 2. Option B is incomplete because it leaves out the output 1. Option C is correct because it contains both actual images, without repeating 2. Option D is the domain \(A=\{a,b,c\}\), not the range; those symbols are inputs, not outputs. The codomain is \(B=\{1,2\}\), and here the range happens to equal the codomain, but the two ideas should still be kept separate. Memory cue: domain means inputs, codomain means allowed outputs, and range means outputs actually reached.

Related tags

Relations-FunctionsRangeCodomainHard

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