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Q.

Let A be a non-singular matrix of order  three such that  A=adj(A+AT) then which of the following statement(s) is(are) TRUE?

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a

adj(A1)=A1024

b

A1=A16

c

adj(A1)=64A

d

A1=16A

answer is B, C.

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Detailed Solution

Apply transpose to the given equation, we get  A=AT
A is symmetric matrix
A=Adj(2A)            |A|=164         2A2=2A adj(2A)=|2A|I=8|A|I=I8         A1=16A            Adj(A1)=Adj(16A)=64 Adj(2A)=64A

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