Joseph is making a pentagonal prism using identical straws. How many straws does he need ?

1. 20

2. 18

3. 15

4. 10

In case of a hexagonal pyramid, F = no. of faces and V = no. of vertices, then F + V is:

1. 10

2. 12

3. 14

4. 16

Statement 1: The number of vertex in a pyramid is one more than the number of sides in a polygon.

Statement 2: A polyhedron may have 10 faces 20 edges and 15 vertices.

Which of the following options is correct?

1. Both the statements are true.

2. Both the statements are false.

3. Statement 1 is true, and statement 2 is false.

4. Statement 1 is false, and statement 2 is true.

Assertion (A) : In a polyhedron, there are 6 vertices, 12 edges then the number of faces are 8.

Reason (R) : In a pentagonal pyramid there are 6 faces, 6 vertices and 10 edges.

1. Both A and R are correct, and R is the correct explanation for A.

2. Both A and R are correct, and R is not the correct explanation for A.

3. A is true, but R is false.

4. A is false, but R is true.