CUET Mathematics 2026 18th May Shift 2 PYQs

If P and Q are symmetric matrices, then QP-PQ is

If $A=\begin{bmatrix}\lambda & 0 & 0\\0 & \lambda & 0\\0 & 0 & \lambda\end{bmatrix}$, $\lambda\ne0$, then $|adjA|$ is equal to

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