Question

If a function defined from $A$ to $B$ as follows


Then the correct options is/are

• A. Image of $2$ under $f$ is $4$
• B. Image of $5$ under $f$ is $10$
• C. Preimage of $4$ under $f$ is $8$
• D. Preimage of $6$ under $f$ is $3$

Answer 1

Answer: (A), (B), (D)

Preimage of $6$ under $f$ is $3$

Here, function is defined from $A$ to $B$
$f\left(1\right)=2$
$f\left(2\right)=4$
$f\left(3\right)=6$
$f\left(4\right)=8$
$f\left(5\right)=10$

Image of $2$ under $f$ is $4$
Image of $5$ under $f$ is $10$
Preimage of $4$ under $f$ is $2$
Preimage of $6$ under $f$ is $3$