If vmatrix (A+B) & - (A+B) & 2B A & A & B - A & A & B vmatrix = 0, then the value of B is

MHT CET 2023 Mathematics question

If , then the value of B is

Answer: (B)

Expand along the first row. Cofactor of : . Cofactor of (with sign ): , so that term is . Cofactor of : . So

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Question ID VK-094633