Question

Which of the following represent a function?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

A $\to$ Second element does not have any image

$\Rightarrow$ It is not a function

B $\to$ is a function

C $\to$ second element is mapped to two elements $\Rightarrow$ It is not a function

D $\to$ Second element does not have an image. Therefore it is not a function