Graphe probabiliste

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\node[draw,circle] (C) [right=2cm of B] {$C$} ;
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\node[draw,circle] (D) [right=2cm of C] {$D$} ;
\node[draw,circle] (A) [below=2cm of C] {$A$} ;
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\draw[postaction=decorate] (D) to[bend left] node[midway,above]{$\cdots$} (A) ;
\draw[postaction=decorate] (A) to[bend left] node[midway,below]{$\cdots$} (D);
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