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If \( \left[\begin{array}{ll}1 & 1 \\ 0 & 1\end{array}\right]\left[\begin{array}{ll}1 & 2 \\ 0 & 1\end{array}\right]\left[\begin{array}{ll}1 & 3 \\ 0 & 1\end{array}\right] \ldots \ldots . .\left[\begin{array}{cc}1 & \mathrm{n}-1 \\ 0 & 1\end{array}\right]=\left[\begin{array}{cc}1 & 78 \\ 0 & 1\end{array}\right] \), then
P
IV the inverse of \( \left[\begin{array}{ll}1 & \mathrm{n} \\ 0 & 1\end{array}\right] \) is
(a) \( \left[\begin{array}{cc}1 & -13 \\ 0 & 1\end{array}\right] \)
(b) \( \left[\begin{array}{cc}1 & 0 \\ 12 & 1\end{array}\right] \)
(c) \( \left[\begin{array}{cc}1 & -12 \\ 0 & 1\end{array}\right] \)
(d) \( \left[\begin{array}{cc}1 & 0 \\ 13 & 1\end{array}\right] \)
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