यदि \(\left[ {\begin{array}{*{20}{c}}
1&1\\
0&1
\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}
1&2\\
0&1
\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}
1&3\\
0&1
\end{array}} \right]\,........\left[ {\begin{array}{*{20}{c}}
1&{n - 1}\\
0&1
\end{array}} \right]\, = \,\left[ {\begin{array}{*{20}{c}}
1&{78}\\
0&1
\end{array}} \right]\) है तो \(\left[ {\begin{array}{*{20}{c}}
1&n\\
0&1
\end{array}} \right]\) व्युत्क्रम (inverse) है:

1. A \(\left[ {\begin{array}{*{20}{c}}
   1&{ - 12}\\
   0&1
   \end{array}} \right]\)
2. B \(\left[ {\begin{array}{*{20}{c}}
   1&0\\
   {13}&1
   \end{array}} \right]\)
3. C \(\left[ {\begin{array}{*{20}{c}}
   1&0\\
   {12}&1
   \end{array}} \right]\)
4. D \(\left[ {\begin{array}{*{20}{c}}
   1&{ - 13}\\
   0&1
   \end{array}} \right]\)