ECZ 2020 · O-Level Paper 1 — Sequences and Series
For the sequence 7, 11, 15, 19, ..., find the sum of the first 16 terms.
- A. 592
- B. 616
- C. 1184
- D. 296
Verified working — step 1
Adding sixteen terms one by one would work, but the sum formula is faster: Sn = n2(2a + (n - 1)d).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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