Answer: 3×5.
- A 3×5
- B 5×3
- C 15×1
- D 8×1
Correct answer: A. 3×5
Explanation: Order is written as (rows)×(columns), so 3×5.
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