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If R={(2,5),(4,5),(6,7)}, which statement about R is correct?

Answer and explanation

Correct answer: R is a function

A relation from a set of inputs to a set of outputs is a function when every input has exactly one output. In R, the first components are 2, 4 and 6, and each appears exactly once: 2 maps to 5, 4 maps to 5, and 6 maps to 7. Therefore R is a function. It is a many-one function because two different inputs, 2 and 4, have the same image 5; this is allowed. What is not allowed is one input having two different images. Thus option B is incorrect, option C is incorrect because 2 has only one image, and option D is plainly false because R contains three ordered pairs. The repeated second component does not violate the definition.

Related tags

Relations And FunctionsFunctionsMany-One FunctionOrdered PairsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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