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JEE Main 2016 Mathematics question

MathematicsMatricesJEE Main 2016

If and A adj A = , then 5a + b is equal to

Answer: (B)

Solution

A adj A = |A|I = (10a + 3b)I. Comparing with $ = Missing \end{bmatrix}\begin{bmatrix} + & 15a - 2b

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Question ID VK-008911