\begin{tikzpicture}%
\begin{scope}[xshift=0cm,yshift=0cm]

    \node[right] at (2,0) {$\frac{1}{4}$};
  \tikzstyle{every node}=[circle, fill, draw,radius=2pt inner sep=1pt,scale=0.5]
    \node (i1) at (1,0) {};
    \node (i2) at (1.5,0) {};
    
 	\draw [thick] (1,0) circle [radius=0.15]; 
	\draw [thick] (1.5,0) circle [radius=0.15];    


\end{scope}

\begin{scope}[xshift=5cm,yshift=0cm]
  \node[right] at (2,0) {$-\frac{1}{12}\frac{d+1-s_2}{d+1-s_1}$};
  \tikzstyle{every node}=[circle, fill, draw,radius=2pt inner sep=1pt,scale=0.5]

    \node (i2) at (1.5,0) {};
    \node (i1) at (1,0) {};
    
   
 	\draw [thick] (1,0) circle [radius=0.15]; 
    \draw [thick] (i1) to[out=30, in=150] (i2);


\end{scope}

\begin{scope}[xshift=10cm,yshift=0cm]
\node[right] at (2,0) {$-\frac{1}{12}\frac{s_1}{s_2}$};
  \tikzstyle{every node}=[circle, fill, draw,radius=2pt inner sep=1pt,scale=0.5]
    \node (i1) at (1,0) {};
    \node (i2) at (1.5,0) {};    
  
    
 	\draw [thick] (1.5,0) circle [radius=0.15]; 
    \draw [thick] (i1) to[out=30, in=150] (i2);

\end{scope}

 \end{tikzpicture}

