ECZ 2018 · GCE Paper 1 — Sequences and Series
The first three terms of an arithmetic progression are 5, 7 and 9. Find the common difference.
- A. 5
- B. 4
- C. −2
- D. 2
Verified working — step 1
The common difference is any term minus the term before it: 7 − 5 = 2 (and 9 − 7 = 2 confirms it). So d = …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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