Which one of the following statements is always true for a real-valued function ?

MATHEMATICS · Single correct · A Level · Mathematics · Algebra and Functions · Algebra and Functions

Problem

Which one of the following statements is always true for a real-valued function f:A→Bf: A \to B? (a) A⊆Range⁡(f)A \subseteq \operatorname{Range}(f) (b) Range⁡(f)=B\operatorname{Range}(f) = B (c) Range⁡(f)⊆B\operatorname{Range}(f) \subseteq B (d) Range⁡(f)=A\operatorname{Range}(f) = A

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