Question

Let A be a matrix such that there exists a square sub-matrix of order r which is non-singular and every square sub-matrix of order r or higher is singular, then rank of A is​

Answer 1

Answer:

If A is a matrix such that there exists a square submatrix oforder r which is non-singular and every square submatrixof order r + 1 or more is singular, then(a) rank (A) = r + 1(b) rank (A) = r.