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If set A has 2 elements and set B has 4 elements, how many functions are possible from A to B?

Answer and explanation

Correct answer: \(4^2\)

For a function from A to B, each of the 2 elements of A can be mapped to any of the 4 elements of B. Hence, the total number of functions is \(|B|^{|A|}=4^2=16\). The expression \(2^2\) incorrectly ignores the 4 available choices in B. Exam tip: For functions from A to B, use \(|B|^{|A|}\), with the codomain size as the base and the domain size as the exponent.

Related tags

Relations And FunctionsFunctionsCountingDomain And CodomainFunction FormulaFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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