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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 the equation
`A A^(T) =9I,` where `I` is `3xx3` identity matrix, then the
ordered pair (a, b) is equal to

A

(2-1)

B

(-2,1)

C

(2,1)

D

(-2,-1)

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