Answer: 0.
- A 1
- B 0
- C −1
- D 2
Correct answer: B. 0
Explanation: A² = A gives det(A)² = det(A), so det(A) is 0 or 1; since A ≠ I and A is singular here, det(A) = 0.
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