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A solid has 12 vertices and 30 edges How many faces...

This question belongs to Arithmetic Ability Mensuration 3D
Mensuration 3D
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A solid has 12 vertices and 30 edges. How many faces does it have?

Answer & Solution
Correct Answer: Option D
In a solid by Euler's formula
Faces + Vertices - 2 = Edges
⇒ Faces + 12 - 2 = 30
⇒ Faces = 30 - 10 = 20
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