Trace of a scalar matrix of order `4xx4` whose one of the principal diagonal elements is 4 is _______ .

The inverse of a scalar matrix A of order 2 xx 2 , where one of the principal diagoanl elements is 5, is _____.

The sum of the principal diagonal elements of a square matrix is called

The sum of the principal diagonal elements of a square matrix is called

If A is a matrix of order 3xx 4 , then each row of matrix A contains elements :

If A is a 2 xx 2 scalar matrix and 7 is the one of the elements in its principal diagonal, then the inverse of A is_____.

If A is a matrix of order 3 xx 4 , then each column of matrix A contains elements :

If A be a matrix of order 3xx4 , then elements of A, are

In a skew-symmetric matrix, every principal diagonal element is