ECZ 2020 · GCE Paper 1 — Sets
Given that S = {x: 1 < x ≤ 15, x is a prime number}, list the elements of set S.
- A. {3, 5, 7, 11, 13}
- B. {1, 2, 3, 5, 7, 11, 13}
- C. {2, 3, 5, 7, 11, 13}
- D. {2, 3, 5, 7, 9, 11, 13}
Verified working — step 1
A prime has exactly two factors: 1 and itself. Test each number from 2 to 15 - and note that 1 is excluded twice over: by the condition 1 < x AND by not being prime.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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