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If \(|A|=2\) and \(|B|=3\), what is the total number of functions from \(A\) to \(B\)?

Answer and explanation

Correct answer: \(3^2\)

If \(|A|=m\) and \(|B|=n\), the number of functions from \(A\) to \(B\) is \(n^m\). Each of the 2 elements of \(A\) can be mapped independently to any of the 3 elements of \(B\), giving \(3^2=9\) functions. \(2^3\) is incorrect because it reverses the roles of the domain and codomain. Exam tip: use \(|B|^{|A|}\) for the number of functions from \(A\) to \(B\).

Related tags

Relations And FunctionsFunctionsCounting FunctionsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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