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Question

If A=[abcd], then A1 =   [MP PET 1988]
 



A

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B

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C

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D

None of these

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Solution

The correct option is B


A1 = adjA|A|

But, |A| =[abcd] = ab - cd  and adj A =[bcda]

Therefore, A1 = 1abcd [bcda]


Mathematics

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