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The relation R = {(x,y): |x-y| = 1, x ∈ {1,2,3}, y ∈ {1,2,3,4}} is considered from X to Y. Why is it not a function?

Answer and explanation

Correct answer: Because x = 2 has two images

The relation condition |x - y| = 1 means that y must be one unit away from x. For x = 1, the possible codomain values are y = 2, so it has one image. For x = 2, both y = 1 and y = 3 satisfy the condition, giving two images. For x = 3, y = 2 and y = 4 are possible, again showing the relation may have multiple outputs. A function must assign exactly one output to every input in its domain. The two images of x = 2 alone are enough to disqualify the relation, so option B is correct. The presence of 4 in Y is not itself a problem, and x = 1 does have an image.

Related tags

RelationFunction-TestAbsolute-DifferenceFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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