Intermediate Mathematics
1. Given matrices A (3×4) and B (4×2), which statement is true about AB?
- AB is defined and has dimensions 3×2
- AB is not defined because the inner dimensions differ
- AB is defined and has dimensions 4×4
- AB is defined and has dimensions 2×3
Answer and explanation
A. AB is defined and has dimensions 3×2
The inner dimensions match: 4 = 4. The result takes A's row count and B's column count, giving 3×2.