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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2019/ii/paper-2/11h/a/solution

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Past exam of the mathematics course of the University of Cambridge / 2019 / ii / Paper 2 / 11H / a / Solution by Codex 0 Created 2026-09-24 Updated 2026-10-03
Read the colours from left to right. If every neighbouring pair had the same colour, mathematical induction would make every point the same colour as , contradicting the different colour of . Therefore at least one adjacent pair has different colours.
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