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If \(A=\{1,2,3\}\), \(B=\{1,4,9,16\}\), and \(R=\{(x,y):y=x^2\}\) is a relation from \(A\) to \(B\), which of the following statements is correct?

Answer and explanation

Correct answer: It is a function and its range is \(\{1,4,9\}\)

Each element of \(A\) has exactly one image in \(B\) under \(y=x^2\): \(1\mapsto1\), \(2\mapsto4\), and \(3\mapsto9\). Hence, the relation is a function and its range is \(\{1,4,9\}\). The codomain is the complete set \(B=\{1,4,9,16\}\), so option A is incorrect. The fact that \(16\) has no preimage does not disqualify the relation from being a function. Exam tip: The range is always a subset of the codomain, and the codomain may contain elements absent from the range.

Related tags

Relations And FunctionsFunctionsRangeCodomainSquare FunctionFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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