Scalar matrix and identity matrix

If an idempotent matrix is also skew symmetric then it can not be 1 an involutary matrix 2 an identity matrix 3 an orthogonal matrix 4 a null matrix.

Which of the following is a symmetric matrix? (A) a null matrix (B) a triangular matrix (C) an idenity matrix (D) a diagonal matrix

" For the matrix A and identity matrix "I," if "AB=BA=I" then that matrix "B" is inverse matrix and "A" is invertible "A^-1=

For the matrix A and identity matrix I if AB=BA=I then that matrix B is inverse matrix and A is invertible (AB)^(-1)=

Multiplication of a matrix A with identity matrix

A is a square matrix and I is an identity matrix of the same order. If A^(3)=O , then inverse of matrix (I-A) is

Choose the correct answer If A,B are symmetric matrices of same order,then AB BA is a (A) Skew symmetric matrix (B) Symmetric matrix (C) Zero matrix (D) Identity matrix

Square matrix and diagonal matrix

Row matrix and column matrix

Let matrix B be the adjoint of a square matrix A.I be the identity matrix of same order as A. If k(ne 0) is the determinant of the matrix A. then what is AB equal to ?