If a solid is having 5 faces and 5 vertices, then find the number of edges .

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Solution

The correct option is B 8
By the Euler's formula, we know that
Number of faces + number of vertices - number of edges = 2
Let the number of edges be x.
$\Rightarrow 5 + 5 - x = 2$
$\Rightarrow x = 10 - 2 = 8$
Hence, the number of edges = 8

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