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JEE Main 2013 Mathematics question

MathematicsMatricesJEE Main 2013

If p, q, r are 3 real numbers satisfying the matrix equation, then 2p + q − r equals :

Answer: (1)

Solution

Columns give: 3p + 3q + 2r = 3, 4p + 2q = 0, p + 3q + 2r = 1. From the second q = −2p; subtracting the

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Question ID VK-104062