batang korek api 2

\begin{tikzpicture}[scale=.8]
\draw[thick,Red3] (0,0) circle (.4) node[black] {$3$};
\draw[thick] (1.5,0) circle (.4) node[] {$9$};
\draw[thick] (3,0) circle (.4) node[] {$18$};
\draw[thick] (4.5,0) circle (.4) node[] {$30$};
\end{tikzpicture}