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In which option is R a relation but not a function?

Answer and explanation

Correct answer: R={(1,2),(1,3)}

The governing concept is the defining condition of a function. Any set of ordered pairs is a relation, but it is a function only if each first component is associated with exactly one second component. In option A, the input 1 appears twice and is paired with two different outputs, 2 and 3. Thus R is certainly a relation, but it fails the function test because one input has more than one image. Therefore option A is correct. In option B, the first components 1 and 2 are different and each has one image. The same is true in option C for 1 and 2 and in option D for 3 and 4. Those options can therefore represent functions on their displayed domains. The issue is not repeated outputs; it is a repeated input with different outputs.

Related tags

FunctionsRelation-Not-FunctionOrdered-PairsMathematicsClass 11Functions As A Special Kind Of RelationRelations And FunctionsClass 11 Mcq

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