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What is called the range of a function?

Answer and explanation

Correct answer: All actually obtained real values

The range of a function is the set of output values that the function actually produces when every permitted input from its domain is used. It is therefore a subset of the codomain in the usual definition. For example, if f(x) = x² with domain ℝ and codomain ℝ, the outputs can never be negative, so the range is [0, ∞), even though the codomain is all real numbers. The domain concerns allowed inputs, while the range concerns obtained outputs. Hence option B is correct. Option A describes the domain, option C merely names the codomain rather than defining the range, and option D is not a mathematical definition.

Related tags

RangeFunctionsDomain And CodomainReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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