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Q.

Which amongst the following is not a polyhedron?


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a

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b

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c

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d

None of these 

answer is C.

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Detailed Solution

Polygons are the faces of a polyhedron.
Only the cone has a curved face among the other options. Option 1 is a cube which belongs to the polyhedron since squares (Polygon) are the faces.
Option 2 is a square pyramid which belongs to the polyhedron since triangles (Polygon) are the faces.
Therefore, the correct answer is option 3.
 
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