question_answer 54)

Let A be a non-singular matrix of order 3 × 3. Then |adj A| is equal to         (a) |A|                                  (b) |A|2        (c) |A|3                                 (d) 3|A|  

Answer:

We know that          (adj A) A = |A| I = |A|                         (By taking |A| as common from R1, R2 and R3)