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What is correct about the relation R = {(x, y): y = |x|, x ∈ {−2, −1, 0, 1, 2}, y ∈ {0, 1, 2}}?

Answer and explanation

Correct answer: It is a function and its range is {0, 1, 2}.

The function criterion concerns each input having exactly one output, not different inputs having different outputs. Evaluating y = |x| gives |−2| = 2, |−1| = 1, |0| = 0, |1| = 1, and |2| = 2. Thus every member of the stated domain has one and only one image, and all images belong to the stated codomain {0,1,2}. The distinct output values are 0, 1, and 2, so the range is {0,1,2}. Therefore option A is correct. Option B incorrectly treats repeated outputs as forbidden, option C is false because 2 maps to 2, and option D confuses the domain with the range.

Related tags

Function TestAbsolute ValueRangeFinite RelationsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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