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If A=[(1,2,2),(2,1,-2),(a,2,b)] is a mat...

If `A=[(1,2,2),(2,1,-2),(a,2,b)]` is a matrix satisfying `"AA"^T=9I_3` , then find the values of `a` and `b` .

A

`1,2`

B

`-1,2`

C

`-1,-2`

D

`-2,-1`

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The correct Answer is:
D
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