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Question

If A is a square matrix such that A(adj A)=400040004, then value of det(adjA) equals to

A
16
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B
256
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C
64
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D
4
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Solution

The correct option is A 16
A(adjA)=|A|.I=4I
Then |adjA|=|A|n1=431=16, where order of matrix A is n=3

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