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MHT CET 2023 Mathematics question

MathematicsDeterminantsMHT CET 2023

If and is a cofactor of , then the value of is

Answer: (D)

Solution

The sum of the products of the elements of a row with their own cofactors equals the determinant, so the required value is (expansion along row 2). Expanding along row 1:

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Question ID VK-098073