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Q.

Which of the following will not form a polyhedron?


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a

3 triangles

b

2 triangles and 3 parallelograms

c

8 triangles

d

1 pentagon and 5 triangles 

answer is A.

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Detailed Solution

We know that polyhedron is a solid form bordered by polygonal areas.
Let us check for each of the options.
Check for option (1) 3 triangles cannot form a polyhedron.
Check for option (2) 2 triangles and 3 parallelograms can form a polyhedron.
Check for option (3) 8 triangles can form a polyhedron.
Check for option (4) 1 pentagon and 5 triangles can form a polyhedron
The correct option is (1).
 
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