Question 172
In this exercise, the letters represent numerals. Determine each of the sum portions below. $$
\begin{array}{r}
a b c d e f \\
a b c d e f \\
+\quad g h i j \\\hline d e f h j f
\end{array}
$$
\begin{array}{r}
a b c d e f \\
a b c d e f \\
+\quad g h i j \\\hline d e f h j f
\end{array}
$$