ECZ 2017 · O-Level Paper 1 — Matrices
Given that A = 321430 and B = 123321010, find AB as a single matrix.
- A. 6710131415
- B. 91111131415
- C. AB is not possible
- D. 91311141115
Verified working — step 1
Check the sizes first: A is 2 × 3 and B is 3 × 3 - the inner 3s match, so AB exists and is 2 × 3. Then row times column, six times.The full step-by-step working and final answer, plus the video lesson for this topic, are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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