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Which condition is necessary and sufficient for a function \(f:A\to B\) to be one-one?

Answer and explanation

Correct answer: For all \(x_1,x_2\in A\), \(f(x_1)=f(x_2)\Rightarrow x_1=x_2\)

In a one-one function, two different elements of the domain cannot have the same image. Hence, if \(f(x_1)=f(x_2)\), it must follow that \(x_1=x_2\); this is exactly option A. Option B is the condition for an onto function, which is not required for a function to be one-one. Option C directly shows that the function is not one-one. Exam tip: If equal outputs force the inputs to be equal, the function is one-one.

Related tags

One-One FunctionInjective FunctionRelations And FunctionsClass 12 MathematicsFunction PropertiesOne One FunctionMathematicsClass 12 Mcq

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