ECZ 2024 · O-Level Paper 1 — Sequences and Series
Given that 99, 92 and 85 are the first three terms of an arithmetic progression, find the nth term.
- A. 99 - 7n
- B. 106 - 7n
- C. 106 + 7n
- D. 7n - 106
Verified working — step 1
Substitute a and d into a + (n - 1)d, then expand with care: the -7 multiplies both n and -1.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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