ECZ 2015 · O-Level Paper 1 — Sequences and Series
Given that m is the number of tiles in pattern number n of the floor-tile patterns shown, find a formula for m in terms of n.
- A. m = 4n + 3
- B. m = 4n − 3
- C. m = 4n − 1
- D. m = 2n − 1
Verified working — step 1
a = 1, d = 4: m = a + (n − 1)d = 1 + 4(n − 1) = …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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