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Question
Replace each * by the correct digit in the following:
\[\begin{array}{r}
&\texttt{6 1 7 2}\\
-&\texttt{* * 6 9}\\
\hline
&\texttt{2 9 * *}
\end{array}\]
Solution
\[\begin{array}{r}
&\texttt{6 1 7 2}\\
-&\texttt{3 2 6 9}\\
\hline
&\texttt{2 9 0 3}
\end{array}\]
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