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Question

A polyhedron with 20 faces and 30 edges has ___ vertices.


A

10

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B

11

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C

12

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D

13

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Solution

The correct option is C

12


F = 20, E = 30, V = ?

Using Euler's formula we get

F + V - E = 2

20 + V - 30 = 2

V - 10 = 2

V = 12

Hence (C)


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