Let A=[(1,2,2),(2,1,2),(2,2,1)]. Then...

Let `A=[(1,2,2),(2,1,2),(2,2,1)]`. Then

A

`A^2-4A-5I_3=0`

B

`A^(-1)=1/5(A-4I_3)`

C

`A^3` is not invertible

D

`A^2` is invertible

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The correct Answer is:

A, B, D

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