Let M= bmatrix 0 & 1 & a 1 & 2 & 3 3 & b & 1 bmatrix and adj ,M= bmatrix -1 & 1 & -1 8 & -6 & 2 -5 & 3 & -1 bmatrix where a and b are real numbers. Which of the following options is/are correct?

JEE Advanced 2019 Mathematics question

Let

M= and adj M=

where and are real numbers. Which of the following options is/are correct?

Answer: (A),(B),(D)

Entry (1,1) of adj is the cofactor . Entry (1,3) is . So : (A) correct. . (B) and , so the sum is : correct.

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Question ID VK-026849