Answer: 1.
- A 0
- B 1
- C 3
- D Any value
Correct answer: B. 1
Explanation: The identity matrix I has 1s on the main diagonal and 0s everywhere else. It acts like the number 1 in matrix multiplication.
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