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

The number of diagonals of a decagon:

The number of diagonals in a polygon of seven sides is

The number of row(s) in a row matrix are ………….

The number of column(s) in a column matrix are …………..

How many different diagonal matrices of order n can be formed which are involuntary ?

The inverse of a diagonal matrix is a. a diagonal matrix b. a skew symmetric matrix c. a symmetric matrix d. none of these

Find the number of diagonals in the convex polygon of n sides .

If A is a square matrix of order n, then |adj A|=

If A is a matrix of order mxxn, then rho (A) is

If A is a skew symmetric matrix of order n and C is a column matrix of order nxx1 ,then C^(T)AC is