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If A = {1} and B = {2, 3, 4}, how many functions can be formed from A to B?

Answer and explanation

Correct answer: 3

Set A has only one element, 1. Its image can be any one of the three elements of B: 2, 3, or 4. Hence, the total number of functions is 3, that is, 3^1 = 3. Option 1 would represent only one particular function, not all possible functions. Exam tip: If the domain has n elements and the codomain has m elements, the number of functions is m^n.

Related tags

FunctionsCountingRelations And FunctionsDomain And CodomainFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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