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A polyhedron has 25 faces and 36 edges. How many vertices does it have?

11

12

13

14

Verified Answer :

Use the following formula valid fo every polyhedron. 

v-e+f=2 

Search for Euler characteristic, or Euler-Poicare characteristic for more depth about this formula 

v= number of vertices 

e=number of edges 

f=number of faces 

You get v=13

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