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If \(|A|=3\) and \(|B|=4\), how many functions are there from set A to set B?

Answer and explanation

Correct answer: \(4^3\)

Each of the 3 elements of A can be mapped independently to any of the 4 elements of B. Hence, the total number of functions is \(|B|^{|A|}=4^3=64\). The expression \(3^4\) reverses the roles of the domain and codomain. Exam tip: The number of functions from A to B is always \(|B|^{|A|}\).

Related tags

FunctionsRelationsFinite-SetsCountingDomain-CodomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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