If `A=[a_(ij)]_(mxxn)` is a matrix of rank r then (A) `rltmin{m,n}` (B) `rlemin{m,n}` (C) `r=min{m,n}` (D) none of these

A = [a_(ij)]_(mxx n) is a square matrix , if

For a matrix A of rank r (A) rank (A\')ltr (B) rank (A\')=r . (C) rank (A\')gtr (D) none of these

Let A by any mxxn matrix then A^2 can be found only when (A) mltn (B) m=n (C) mgtn (D) none of these

If A = [a_(ij)] is a skew-symmetric matrix of order n, then a_(ij)=

A=[a_(ij)]_(m xx n) is a square matrix,if (a)m

For a non singular matrix A of order n the rank of A is (A) less than n (B) equal to n (C) greater than n (D) none of these

If A=[a_(ij)]_(mxxn) and B=[b_(ij)]_(nxxp) then (AB)^\' is equal to (A) BA^\' (B) B\'A (C) A\'B\' (D) B\'A\'