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Question
Choose the correct alternative:
If A = `[(1, 2, 2),(2, 1, -2),("a", 2, "b")]` is a matrix satisfying the equation AAT = 9I, where I is 3 × 3 identity matrix, then the ordered pair (a, b) is equal to
Options
(2, – 1)
(– 2, 1)
(2, 1)
(– 2, – 1)
Solution
(– 2, – 1)
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