1. If A and B are two matrices of the order 3 × m and 3 × n, respectively, and m = n, then the order of matrix (5A – 2B) is

2. If matrix A = [a] where a= {\(_{0 if i = j}^{1 if i ≠ j}\) then A² is equal to

3. If A is matrix of order m × n and B is a matrix such that AB’ and B’A are both defined, then order of matrix B is

4. If A and B are matrices of same order, then (AB’ – BA’) is a

5. If A is a square matrix such that A² = I, then (A – I)³ + (A + I)³ – 7A is equal to

6. For any two matrices A and B, we have

7. The number of all possible matrices of order 3 × 3 with each entry 0 or 1 is

8. A square matrix A = [a]is called a diagonal matrix if a= 0 for

9. A square matrix A = [a] is called a lower triangular matrix if a = 0 for

10. The matrix A = \(\left[\begin{array}{cc}0 & 1 \\1 & 0\end{array}\right]\) is a