If a matrix has 8 elements, what are the possible numbers of orders?

If the system of equations, x + 2y - 3z = 1, (k + 3) z = 3, (2k + 1) x + z = 0 is inconsistent, then the value of k is

For any square matrix A, AA' is a

If the system of equations x + ay = 0, a z + y = 0 and a x + z = 0 has infinite solutions, then the value of a is

The matrix product AB = O, then

If I is a unit matrix, then 3I will be

. If area of triangle is 35 sq. units with vertices (2, - 6), (5, 4) and (k, 4). Then k is

If A, B are symmetric matrices of same order, then AB - BA is a

Matrices A and B will be inverse of each other only if

If the matrix A is both symmetric and skew symmetric, then