#Q58 Let D be a non-zero n×n real matrix with n≥2. Which of the following implications is valid?

#Q59 Let A,B be n×n real matrices. Which of the following statements is correct ?

#Q60 The row space of a 20×50 matrix A has dimension 13. What is the dimension of the space of solutions of Ax=0?

#Q61 Let A be a m×n matrix of rank n with real entries. Choose the correct statement

#Q62 Let A be an n×m matrix with each entry equal to +1,-1 or 0 such that every column has exactly one +1 and exactly one – 1 . We can conclude that

#Q63 Let A be (m × n) matrix and B be a (n × m)matrix over real numbers with m < n. Then

#Q64 Let A and B be 2 X 2 matrices. Then which of the following is true ?