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If A = {1, 2, 3}, B = {0, 1}, and R = {(x, y): y ≡ x (mod 2)}, what is correct about R?

Answer and explanation

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

A function requires every element of A to have exactly one image in B; different inputs are allowed to share the same image. Using congruence modulo 2, 1 and 3 are odd, so their corresponding value is 1 in B, while 2 is even, so its corresponding value is 0. Therefore the relation contains (1,1), (2,0), and (3,1). Each element of A appears once as a first component, so R is a function. Its set of actual outputs is {0,1}, which is also B. Hence option B is correct. Option A confuses repeated outputs with failure of the function rule, option C names the domain rather than the range, and option D overlooks the image (2,0).

Related tags

FunctionsModular ArithmeticRangeRelationsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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