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If in an arrow diagram of a relation, one element of A points to two different elements of B, what is the conclusion?

Answer and explanation

Correct answer: It is not a function

The defining condition for a function from A to B is that every element of A must have exactly one image in B. If one element of A points to two distinct elements of B, that input has two images, so the relation is not single-valued. This single violation is sufficient to conclude that the relation is not a function, regardless of the number of elements in B or whether A and B are equal. Therefore option A is correct. Option B incorrectly reverses the function condition. Options C and D introduce irrelevant restrictions: a codomain may contain any appropriate number of elements, and a function does not require A and B to be equal. Other arrows in the diagram cannot repair the fact that one input has two outputs.

Related tags

Relations FunctionsArrow DiagramFunction DefinitionSingle ValuedFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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