Choose the correct answer from the options given below :

If $A = \begin{bmatrix}2 & 3 & 1 \\ 2 & -1 & 0\end{bmatrix}$ and $B^T = \begin{bmatrix}4 & 4 \\ 6 & -2 \\ 2 & 0\end{bmatrix}$, then $4A + B$ is

If $A = \begin{bmatrix}\alpha & \beta\\r & \Delta\end{bmatrix}$, such that $|A| = 25$, then the value of $\left|\frac{1}{5}A\right|$ is.

The system of equation $2x + \lambda y = 8$, $\lambda x + 8y = 3$

has a unique solution if the value of $\lambda$ is (are):

If P and Q are symmetric matrices of same order, then $(PQ - QP)$ is

The value of $\begin{vmatrix} 1 & x & y \\ 1 & x+y & y \\ 1 & x & x+y \end{vmatrix}$ is

If A and B are square matrices of order 3 such that |A| = -1 and |B| = 5, then the value of |3AB| is