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$\begingroup$

Here's my attempt: {x∈Z|0≥x≤12} but my issue is the intervals how do i put more than one rule in this

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    Note that only multiples of $3$ are in the given set. You can just add the rule like $\exists y \in \mathbb Z, x = 3y$.2017-01-26
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    You've heard of the word "and", right? PS You mean "$0\le x$" not "$0 \ge x$".2017-01-26
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    satisfying close vote...2017-01-26

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$\{3n:n\in\mathbb{N}\cup\{0\},n\leq4\}$