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If |A|=3 and A^(-1)=[(3,-1),((-5)/3,2/3)...

If |A|=3 and `A^(-1)=[(3,-1),((-5)/3,2/3)]` then adjA=?

A

`[(9,5),(-5,-2)]`

B

`[(9,-3),(-5,2)]`

C

`[(-9,3),(5,-2)]`

D

`[(9,-3),(5,-2)]`

Text Solution

Verified by Experts

The correct Answer is:
B
`A^(-1)=1/(|A|).adjA rarr adjA=|A|.A^(-1)=3A^(-1)=[(9,5),(-5,2)]`
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