If $R$ is a relation on the set $A=\{1,2,3,4,5,6,7,8,9\}$ given by $x R y \Leftrightarrow y=3 x$, then $R=$
(d) none of theseThe relation R is defined as
$R=\{(x, y): x, y \in A: y=3 x\}$
$\Rightarrow R=\{(1,3),(2,6),(3,9)\}$
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