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Question

If A=[2−3−41], then adj(3A2+12A) is equal to:

A
[72846351]
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B
[51638472]
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C
[51846372]
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D
[72638451]
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Solution

The correct option is B [51638472]
A2=[1691213](3A2+12A)=[72638451]
adj(3A2+12A)=[51638472]

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