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Question

If Adj102112021=5a211022b,then [a b]=

A
[4 1]
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B
[4 1]
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C
[4 1]
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D
[4 1]
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Solution

The correct option is C [4 1]
Let A=102112021
We know that Adj A=CT
where C=Co-factor matrix of A
C=1(4)(1)20(04)10(20)02(2+2)10
=512412201
Now CT=542110221=Adj A
a=4,b=1

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