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Which of the following relations from set A={1,2} to set B={5,6} is not a function?

Answer and explanation

Correct answer: {(1,5),(1,6),(2,5)}

In a function, every element of the domain must have exactly one image. In option A, the input 1 has two different images, 5 and 6, so the relation is not a function. In the other options, both 1 and 2 have exactly one image each. Exam tip: To test a relation quickly, check whether any first coordinate is paired with more than one second coordinate.

Related tags

RelationsFunctionsNot A FunctionDomain And CodomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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