\documentclass[tikz,border=6pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{calc,positioning}
\definecolor{ink}{HTML}{111827}
\definecolor{blue}{HTML}{2563EB}
\definecolor{violet}{HTML}{7C3AED}
\definecolor{paper}{HTML}{FFFDF7}
\begin{document}
\begin{tikzpicture}[font=\small, text=ink]
  \fill[paper] (-3.4,-2.1) rectangle (3.4,2.1);
  \draw[blue, line width=0.9pt, fill=blue!12] (-0.95,0) circle (1.55);
  \draw[violet, line width=0.9pt, fill=violet!12] (0.95,0) circle (1.55);
  \node[blue, font=\bfseries] at (-1.85,1.25) {$Q_1$};
  \node[violet, font=\bfseries] at (1.85,1.25) {$Q_2$};
  \node at (-1.65,-1.25) {$|Q_1|=q=n-f$};
  \node at (1.65,-1.25) {$|Q_2|=q=n-f$};
  \node[draw=ink!45, rounded corners=2pt, fill=paper, inner sep=5pt, align=center] at (0,0) {
    $|Q_1\cap Q_2|\ge f+1$\\
    \scriptsize al menos una correcta
  };
  \node[align=center, font=\footnotesize] at (0,-1.82) {$q=2f+1\ \Longleftrightarrow\ n=3f+1$; para comites mayores, $q=n-f$};
\end{tikzpicture}
\end{document}
