1.

If is any square matrix of order 3 such that |A| = 3, then find the value of |adj A|.

Answer»

Given that is square matrix of order 3 and |A| = 3.

We know that |adj A| = |A|n - 1 , where A is square matrix of order n.

Therefore, |adj A| = |A|3−1 = |A|2 = 32 = 9. (Because, A is square matrix of order 3)

Hence, |adj A| = 9.



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