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Question

For any 2×2 matrix, if A(adjA)=[100010], then
|A| is equal to

A
20
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B
100
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C
10
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D
0
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Solution

The correct option is C 10
A(adjA)=[100010]
We know A(adjA)=|A|I2
|A|I2=[100010]
|A|I2=10I2
|A|=10

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