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Why is R = {(1,2), (1,3), (2,4)} not a function from A = {1,2} to B = {2,3,4}?

Answer and explanation

Correct answer: Because 1 has two images

The governing definition is that a function from A to B must assign exactly one image in B to every element of A. In the given relation, the first component 1 occurs in both (1,2) and (1,3), so the same input 1 is assigned two different outputs, 2 and 3. This violates the uniqueness condition for images. Although the element 2 does have the image 4, that does not repair the violation caused by 1. The codomain B is non-empty and all listed pairs are not identical, so C and D are plainly irrelevant. Thus option A correctly identifies the reason that R is a relation but not a function.

Related tags

FunctionsNot A FunctionOrdered PairsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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