Find all prime numbers p for which p = a + b = c - d, where a, b, c, d are prime numbers (not necessarily distinct).

📜 Leaflet #Prime_number

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Olivia drew a polygon and Liam cut it into a triangle and a quadrilateral. How many sides could Olivia's polygon have? Find all the variants and prove that there are no others.

📜 Leaflet #geometry

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