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Question

If A is a non-singular matrix of order 3, then adj (adj A) is equal to ________________.

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Solution

Given:
A is a non-singular matrix of order 3


As we know,
adj adj A=An-2 A , where n is the order of Aadj adj A=A3-2 A Order of A is 3adj adj A=A1 Aadj adj A=AA


Hence, adj (adj A) is equal to |A|A.

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