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If A =[{:(3,,-3,,4),(2,,-3,,4),(0,,-1,,1...

If `A =[{:(3,,-3,,4),(2,,-3,,4),(0,,-1,,1):}]`, then adj (adj A) is

A

A

B

2A

C

3A

D

None of these

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The correct Answer is:
A
Now, `|A|=|{:(3,,-3,,4),(2,,-3,,4),(0,,-1,,1):}|`
` = 3(-3+4) + 3(2-0) + 4(-2 -0) =1`
` therefore adj (adj A) = |A|^(3-2)*A=A`
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