Mathematics · 2019
JEE Main · 9 January 2019, Shift 2 · Q61
Let A ={x ∈ R: x is not a positive integer }. Define a function f: A → R as f(x)=(2 x)/(x-1), then f is:
Let $\displaystyle \mathrm{A}=\{x \in \mathbf{R}: x$ is not a positive integer $\displaystyle \}$.
Define a function $\displaystyle f: \mathrm{A} \rightarrow \mathbf{R}$ as $\displaystyle f(x)=\frac{2 x}{x-1}$,
then $\displaystyle f$ is :
Official answer
(2)
injective but not surjective
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JEE Main 2019 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.