Find composite of $f$ and $g$ and express it by formula :
$f = {(1, 3), (2, 4), (3, 5), (4, 6)}$
$g = {(3, 6), (4, 8), (5, 10), (6, 12)}$

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Solution

$f = (1, 3), (2, 4), (3, 3), (4, 6)$
$g = (3, 6), (4, 8), (5, 10), (6, 12)$
Refer to image
$g o f (x)$ is $(1, 6), (2, 8), (3, 10), (4, 12)$
$f o g (x)$ is not defined here.

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