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If A={1,2,3}, B={5,6,7}, and R={(1,5),(2,6),(2,7),(3,5)}, which element breaks the function condition?

Answer and explanation

Correct answer: 2

A relation from A to B is a function when every element of the domain A has exactly one image in B. Inspect the ordered pairs by their first components. The element 1 is paired only with 5, and 3 is paired only with 5; both satisfy the uniqueness requirement. However, the element 2 appears in two ordered pairs: (2,6) and (2,7). Thus 2 is assigned two different images, 6 and 7, which violates the function condition. The element 5 is a second component, or image, not a domain element being tested for uniqueness. Therefore option B is correct. A function may allow different inputs to share one output, as 1 and 3 both map to 5; it only forbids one input from having multiple outputs.

Related tags

Relations FunctionsFunction ConditionMultiple ImagesFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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