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If (A={1,2,3}) and (B={1,2,3}), how many functions from (A) to (B) have (f(1)=2) fixed?

Answer and explanation

Correct answer: (9)

A function from A to B assigns one output in B to every input in A. The condition f(1)=2 fixes the output of the first input, so there is no choice left for 1. The values of f(2) and f(3) are still free. Each of these two inputs can independently be assigned any one of the three elements 1, 2, or 3 in B.

Therefore the number of possible functions is \\(3\\) choices for f(2) multiplied by \\(3\\) choices for f(3), giving \\(3^2=9\\). The fixed value does not reduce the choices for the other inputs beyond removing the choice for f(1). Hence option C, 9, is correct. The value 27 would count all functions without the fixed condition, while 6 does not follow from the independent choices.

Related tags

Relations-FunctionsFunction-CountRestrictionHard

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