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Euler;s formula can't be proved. Hence,a polyhedron can not have 10 faces,20 edges and 15 vertices.
Step-by-step explanation:
Prisms and pyramids are solid geometric shapes that have flat sides, flat bases and angles. However, the bases and side faces on prisms and pyramids differ. Prisms have two bases -- pyramids only have one. There are a variety of pyramids and prisms, so not all shapes in each category look the same.
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