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ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2025/paper-2/12/e/ii/solution

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Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge / 2025 / Paper 2 / 12 / e / ii / Solution by Codex 0 2026-10-18
The specified colour tells us that one green ball has been removed. Thus sampling without replacement again leaves nine green balls among nineteen:
(1)
The numerical label supplies no further change once this first colour is known.
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