Question

A relation $R$ is given as $R=\left\{\right(1,8),(2,14),(3,17),(4,20\left)\right\}$ .The domain of this relation is

• A. {$1,2,3,4$}
• B. { $8,14,17,20$}
• C. {$1,2,17,20$}

Answer 1

The correct option is A {$1,2,3,4$}

$\underset{–}{ConceptInvolved:}$
Domain is the collection of the first elements of all the ordered pairs in a relation.

$\underset{–}{Method:}$
Relation $R$ = {$(1,8),(2,14),(3,17),(4,20)$ } .
First elements of ordered pairs of $R$ are {$1,2,3,4$} . This is the required domain set of relation $R$.