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If A = {2} and B = {5, 6}, how many functions can be defined from A to B?

Answer and explanation

Correct answer: 2

Set A has only one element, 2. Its image can be chosen as either 5 or 6 from set B, giving two different functions. Hence, the number of functions is \(2^1 = 2\). Option 1 counts only one possible function, whereas both choices are possible. For such questions, use the formula \(n(B)^{n(A)}\) for the number of functions from A to B.

Related tags

Relations And FunctionsFunctionsCountingDomain And CodomainFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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