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\documentclass{article}
\usepackage{xsim}

\DeclareExerciseCollection{foo}

\usepackage{filecontents}
\begin{filecontents*}{random.tex}
\begin{exercise}[ID=A]
  exercise A
\end{exercise}
\begin{solution}
  solution A
\end{solution}
\begin{exercise}[ID=B]
  exercise B
\end{exercise}
\begin{solution}
  solution B
\end{solution}
\begin{exercise}[ID=C]
  exercise C
\end{exercise}
\begin{solution}
  solution C
\end{solution}
\begin{exercise}[ID=D]
  exercise D
\end{exercise}
\begin{solution}
  solution D
\end{solution}
\begin{exercise}[ID=E]
  exercise E
\end{exercise}
\begin{solution}
  solution E
\end{solution}
\begin{exercise}[ID=F]
  exercise F
\end{exercise}
\begin{solution}
  solution F
\end{solution}
\end{filecontents*}

\begin{document}

\collectexercises{foo}
\input{random.tex}
\collectexercisesstop{foo}

\section*{Exercises}
\printrandomexercises[collection=foo,exclude=D]{3}

\section*{Solutions}
\printsolutions*

\end{document}