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Question

If a solid figure has 15 edges and 10 vertices, then the number of faces of a solid figure is

A
9
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B
7
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C
11
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D
5
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Solution

The correct option is C 7
Using Euler's formula

V+F=E+2

E=15

V=10

10+F=15+2

F=1710

F=7

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