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Which of the following is a constant function from the set A={1,2,3} to the set B={a,b}?

Answer and explanation

Correct answer: {(1,a),(2,a),(3,a)}

In a constant function, every element of A must have the same image in B. In option A, the images of 1, 2, and 3 are all a, so it is a constant function. Options B and C have different images, so they are not constant. Option D is not a function because 1 has two images and 2 has no image. Exam tip: To identify a constant function, check whether the second components of all ordered pairs are identical.

Related tags

Relations And FunctionsConstant FunctionFunctionsOrdered PairsFinite SetsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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