ECZ 2026 · GCE Paper 1 — Probability

The cards 1, 2, 3, 4, 5 and 6 are placed in a box. If a card is selected at random from the box, find the probability that the number on the card is a prime number.

Verified working — step 1

Probability = favourable outcomes ÷ total outcomes. The key step is listing the primes correctly: a prime has exactly two factors, 1 and itself.

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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