Answer: |A| ≠ 0.
- A |A| ≠ 0
- B |A| = 0
- C A = I
- D A is symmetric
Correct answer: A. |A| ≠ 0
Explanation: A matrix has an inverse precisely when its determinant is non-zero (non-singular).
Element aij of matrix A sits at the intersection of row i and column j.
Concept context
Matrix operations, determinants, inverses, and solving linear systems