ECZ 2021 · O-Level Paper 1 — Probability
The probability of getting a black button from a box is 29. Find the probability of getting a button which is not black.
- A. 119
- B. 79
- C. 29
- D. 19
Verified working — step 1
P(not black) = 1 - P(black)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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