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If \(A=\{1,2,3\}\) and \(B=\{0,1,2\}\), how many functions from \(A\) to \(B\) satisfy \(f(1)<f(2)<f(3)\)?

Answer and explanation

Correct answer: 1

The values \(f(1),f(2),f(3)\) must be in strictly increasing order and must belong to \(B\). Since \(B\) has exactly the three elements \(0,1,2\), the only possible ordered triple is \((0,1,2)\). Thus \(f(1)=0, f(2)=1, f(3)=2\), giving exactly one function. Exam tip: when all elements of a three-element codomain must appear in strictly increasing order, their assignment is forced.

Related tags

Relations And FunctionsFunctionsCountingStrict InequalitiesOrdered TuplesFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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