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

If `A = [ (1,2,2),(2,1,-2),(a,2,b)] ` is a matrix satifying the equation `"AA"^(T)= 9I ` where I is a `3xx3` identify matrix , thenthe ordered pair (a,b) is equal to :

A

2

B

`-2`

C

`-3`

D

5

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The correct Answer is:

C

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