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If \(f:\{1,2,3,4\}\to\{0,1\}\) is defined by the rule that \(f(x)=1\) when \(x\) is prime and \(f(x)=0\) when \(x\) is not prime, what is the value of \(f(4)\)?

Answer and explanation

Correct answer: 0

The number 4 is not prime because it has a factor other than 1 and itself, namely 2. Therefore, by the given rule, \(f(4)=0\). Option 1 would apply only if 4 were prime. In an exam, first check whether the input is prime or non-prime.

Related tags

Relations-FunctionsFunctions-As-RelationsPrime-NumbersFunction-RulesDomain-CodomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematics

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