The determinants of the reverse identity matrics are defined as follow

$\left|I_{1}\right|=|1|=+1,\left|I_{2}\right|=\left|\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right|=-\left|I_{3}\right|=\left|\begin{array}{lll}0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 0\end{array}\right|$

If the points $(2,5),(4,6)$ and $(a,a)$ are collinear, then the value of $a$ is equal to

$\begin{vmatrix}a&0&0\\0&b&0\\0&0&c\end{vmatrix}=$ কত?

Three digits numbers $7x,36y$ and $12z$ where $x , y , z$ are integers from $0$ to $9 ,$ are divisible by a fixed constant $k.$ Then the determinant $\left| \begin{array} { l l l } { x } & { 3 } & { 1 } \\ { 7 } & { 6 } & { z } \\ { 1 } & { y } & { 2 } \end{array} \right|$ $\ +48$ must be divisible by

$\mathrm{K}$ এর কোন মানের জন্য $\left[\begin{array}{cc}K+1 & 3 \\ 3 & K-1\end{array}\right]$ ম্যাট্রিক্সটি বিপরীতযোগ্য নয়?