Question

Which of the following relations are functions ? Give reasons. If it is a function determine its domain and range.
(i) $\left\{\right(2,1\left)\right(5,1),(8,1\left)\right(11,1\left)\right(14,1),(17,1\left)\right\}$

Answer 1

First elements are $2,5,8,11,14$ and $17$

All these are not repeating
Clearly, every element of domain is related to unique element of co-domain, so it is a function.
Domain $=\{2,5,8,11,14,17\}$
Range $=\left\{1\right\}$