If you take two regular triangular pyramids and stick them along a common base, what will be the number of edges in the new three dimensional shape formed?

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Solution

The correct option is C 9
A regular pyramidhas 6 edges.
Two of these should have 12 edges but since two of them are joined along the common base, there will be 3 common edges.
So, total number of edges $= 12 - 3 = 9$

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