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Let A B C D be the vertices of a regular...

Let A B C D be the vertices of a regular tetrahedron each of whose edges measures 1 meter. A bug starting from vertex A observes the following rules at each vertex it chooses one of the three edges meeting at that vertex each edge being equally likely to be chosen and crawls along that edge to the vertex at its opposite end. Let p= 729 be the probability that the bug is at vertex A when it has crawled exactly 7 meters. The value of n is

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