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[" Q18.If "A=[[1,2,2],[2,1,-2],[a,2,b]]"...

[" Q18.If "A=[[1,2,2],[2,1,-2],[a,2,b]]" is a matrix satisfying the equation "AA^(TT)=9I" ,where I is a "3times3" identity "],[" matrix,then ordered pair "(a,b)" is equal to: "],[[" (A) "(-2,1)," (B) "(2,1)," (C) "(-2,-1)," (D) "(2,-1)]]

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