The value of

Question:

Let $A=\{x \varepsilon R: x$ is not a positive integer $\}$

Define a function $f: \mathrm{A} \rightarrow \mathrm{R}$ as $f(\mathrm{x})=\frac{2 \mathrm{x}}{\mathrm{x}-1}$ then $f$ is

  1. injective but not surjective

  2. not injective

  3. surjective but not injective

  4. neither iniective nor suriective


Correct Option: 1

Solution:

$f(\mathrm{x})=2\left(1+\frac{1}{\mathrm{x}-1}\right)$

$f^{\prime}(\mathrm{x})=-\frac{2}{(\mathrm{x}-1)^{2}}$

$\Rightarrow f$ is one-one but not onto

Leave a comment

Close

Click here to get exam-ready with eSaral

For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.

Download Now