Question Id : 15775 |
Context : JEE Main 2019 (9 April Morning Shift)
If
$\begin{bmatrix}1 & 1 \\ 0 & 1\end{bmatrix}
\begin{bmatrix}1 & 2 \\ 0 & 1\end{bmatrix}
\begin{bmatrix}1 & 3 \\ 0 & 1\end{bmatrix}
\cdots
\begin{bmatrix}1 & n-1 \\ 0 & 1\end{bmatrix}
=
\begin{bmatrix}1 & 78 \\ 0 & 1\end{bmatrix}$,
then the inverse of
$\begin{bmatrix}1 & n \\ 0 & 1\end{bmatrix}$
is:
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