ECZ 2026 · GCE Paper 1 — Sequences and Series
The first and seventh terms of an arithmetic progression are -11 and 13 respectively. Find the common difference, d.
- A. 247
- B. -4
- C. 24
- D. 4
Verified working — step 1
The seventh term is the first term plus SIX steps of d (not seven), so write T7 = a + 6d and solve.The full step-by-step working and final answer 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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