Let A and B be two 3 3 matrices such that AB = I and |A| = 1/8. Then |adj(B adj(2A))| is equal to

JEE Main 2022 Mathematics question

Let A and B be two matrices such that AB = I and |A| = 1/8. Then |adj(B adj(2A))| is equal to

Answer: (3)

Since AB = I, |A||B| = 1 and |B| = 8. For a matrix |adj M| = . So |adj(B adj(2A))| = |B $

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Question ID VK-034509