If two regular tetrahedrons are stuck together along a common base, the number of edges in the new figure is .
A
9
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B
12
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C
6
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Solution
The correct option is A 9 A tetrahedron has 6 edges. Two tetrahedrons will have 12 edges. After sticking them, 3 edges will be common. So, number of edges = 12 - 3 = 9