Question

Which of the following is/are function(s)?

• A.
• B.
• C.
• D.

Answer 1

Answer: (C), (D)

For given relation to be function, each element in the domain should have only one image in the co-domain.
So, option $\left(c\right)$ and $\left(d\right)$ are functions because every element of the domain has one and only one image in the co-domain.