ECZ 2021 · GCE Paper 1 — Sequences and Series
Given that 9, 15, 21, 27 ... is an Arithmetic Progression, find the twelfth term.
- A. 69
- B. 75
- C. 81
- D. 72
Verified working — step 1
First term a = 9 and common difference d = 6. The nth term is a + (n − 1)d, so the 12th term = 9 + 11 × 6 = 9 + 66 = …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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