If A is a non - null diagonal matrix of order 3 such that `A^(4)=A^(2)`, then the possible number of matrices A are

If A is a diagonal matrix of order 'n 'such that A^(2)=A. then number of possible values of matrix A is

If A is a diagonal matrix of non-positive entries and order 3 such that A^2=I , then

If A is a non-diagonal involutory matrix, then

If A is a non-diagonal involutory matrix, then

If A is a non-diagonal involutory matrix, then

Let A and B are two non - singular matrices of order 3 such that |A|=3 and A^(-1)B^(2)+2AB=O , then the value of |A^(4)-2A^(2)B| is equal to (where O is the null matrix of order 3)

Let A and B are two non - singular matrices of order 3 such that |A|=3 and A^(-1)B^(2)+2AB=O , then the value of |A^(4)-2A^(2)B| is equal to (where O is the null matrix of order 3)

The number of diagonal matrix, A or order n which A^3=A is

Let A be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of A^(2) is 1, then the possible number of such matrices is

Let A be a symmetric matrix of order 2 with integer entries. If the sum of the diagonal elements of A^(2) , is 1, then the possible number of such matrices is , (1) 4 (2) 1 (3) 6 (4) 12