Q. 21

# If A is a 3-rowed square matrix and │A│=4 then adj(adj A)=?

A. 4A

B. 16A

C. 64A

D. none of these

Answer :

The property states that

adj(adj A) = ^{n-2} . A

Here n=2

adj(adj A) = ^{3-2} . A

= 4A

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