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JEE Main 2015 Mathematics question

MathematicsMatricesJEE Main 2015

If is a matrix satisfying the equation , where I is identity matrix, then the ordered pair (a, b) is equal to

Answer: (1)

Solution

means the rows are mutually orthogonal with each of norm 9. Row 1 · Row 3 gives and Row 2 · Row 3 gives $2a + 2 -

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Question ID VK-115210