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If (f:{1,2,3}\to{1,2,3,4,5}) and (f(x)=2x-1), which statement is correct?

Answer and explanation

Correct answer: It is a function and range is ({1,3,5})

The direct answer is A: it is a function and its range is {1,3,5}. The domain is {1,2,3}, and the rule is f(x)=2x-1. Calculate each value: f(1)=2(1)-1=1, f(2)=2(2)-1=3, and f(3)=2(3)-1=5. Every value lies in the codomain {1,2,3,4,5}, so the rule defines a function. The set of values actually obtained is the range {1,3,5}; the codomain need not be completely used. Option A is correct. Option B is wrong because an unused codomain element does not stop a rule from being a function. Option C confuses domain or codomain with range and includes 2, which is not obtained. Option D is wrong because f(3)=5 is allowed and is inside the codomain. Remember: a function need not cover every codomain element.

Related tags

Linear FunctionRangeCodomainHard

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