How do I disprove a set is not a subset of another set?

Given that $T={3t|t inmathbb Z}$, $Q={5q|q inmathbb Z}$, $R={6r|r inmathbb Z}$ and $S={T,Q,R}$.
How can I disprove that Q $subseteq$ R?

I tried the following:

Let $q=2, Q={10}$
Let $r=2, R={12}$,

Therefore Q is not a subset of R.

Is that the right way to disprove the statement?
Thank you.