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    				| 1. | Find the number of vertices in a polyhedron which has 30 edges and 12 faces. | 
| Answer» For any polyhedron, F + V – E = 2 Here, F = 12, V = ?, E = 30 Using above formula, 12 + V – 30 = 2 V – 18 = 2 V = 2 + 18 V = 20 | |