question_answer 32)

If n = p, then the order of the matrix 7X – 5Z is (a) p × 2 (b) 2 × n (c) n × 3 (d) p × n  

Answer:

The order of matrix 7X ? 5Z is same as that of matrix X and Z.        Order of matrix 7X ? 5Z is 2 × n and 2 × p       But n = p (given)        Order of matrix 7X ? 3Z = 2 × n       So, (b) is correct.