Answer: |A|².
- A |A|²
- B |A|
- C |A|³
- D 2|A|
Correct answer: A. |A|²
Explanation: For an n×n matrix, |adj A| = |A|ⁿ⁻¹, which is |A|² when n = 3.
Concept context
Evaluation of determinants, cofactors, adjoint, inverse of matrix, Cramer's rule and area applications. Always in board and JEE.