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If \(A=\emptyset\) and \(B=\{1,2\}\), how many functions can be defined from \(A\) to \(B\)?

Answer and explanation

Correct answer: 1

In a function, every element of the domain must have exactly one image. Since \(A\) is empty, there are no elements whose images need to be chosen, so exactly one empty function exists. The counting formula also gives \(|B|^{|A|}=2^0=1\). Exam tip: there is exactly one function from the empty set to any non-empty set, not zero.

Related tags

FunctionsEmpty DomainRelations And FunctionsCounting FunctionsFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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