ECZ 2012 · O-Level Paper 1 — Sets
Given that E = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}, list the subset A = {x : x is a factor of 55}.
- A. {1, 5, 11, 55}
- B. {5, 11}
- C. {1, 5, 11}
- D. {1, 11}
Verified working — step 1
The factors of 55 are 1, 5, 11 and 55. Only those inside the universal set E count, and 55 is not in E, so A = …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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