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     EduGorilla 
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    If A =  is a matrix satisfying the equation AAT = 9I, where I is 3 x 3 identity matrix, then the ordered pair (a, b) is equal to

    Options :-

    1. (2, – 1)
    2. (– 2, 1)
    3. (2, 1)
    4. (– 2, – 1)
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