Solution e3571c0d-01af-4e40-81a2-678d7faefea3

Points: 1 pt

We see the multiples of $6$ are
\[
\{6,12,18,\ldots\}.
\]

But we can write this using set-builder notation as
\[
\{6i \mid i \in \mathbb{Z}^{+}\}.
\]

Final answer:
\{6i \mid i \in \mathbb{Z}^{+}\}