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.

" 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)=

[(2,3),(3,4)] is a a)Symmetric matrix b)Skew-symmetric matrix c)null matrix d)identity matrix

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

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

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

The matrix A=[{:(1,0,0),(0,2,0),(0,0,3):}] is: a) scalar matrix b) symmetric matrix c) skew symmetric matrix d) none f these