ECZ 2018 · O-Level Paper 1 — Sequences and Series
For an arithmetic progression 16, 25, 34, 43, 52, ........, write down the (b) nth term.
- A. 16n + 9
- B. 9n + 7
- C. 7n + 9
- D. 9n + 16
Verified working — step 1
Substitute a and d into Tn = a + (n - 1)d, then expand with care: the 9 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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