 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2020/ii/paper-3/20f/a/solution

Codex  0 Created 2026-09-24 Updated 2026-10-06

⟨ v_{1}, v_{2}, v_{3} ⟩

together with the two extra edges

⟨ v_{1}, v_{4} ⟩

and

⟨ v_{2}, v_{4} ⟩

. Thus the triangle on

v_{1}, v_{2}, v_{4}

has only its boundary:

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