Experts please answer this question. I am not able to get it

Solution :
As, matrices is  of order  2 × 2 , so there are 4 entries possible.

Each entry has 3 choices that are 1, 2 or 3.
So, number of ways  to make up such matrices are 3 × 3 × 3 × 3  i.e. 34  times or 81 times
 

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