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A group of 2^m - 1 routers are interconnected in a centralized binary tree, with router at each tree node. Router I communicate with router J by sending a message to the root of the tree. The root then sends the message back down to J. Then find the mean router-router path length.

2 (m - 2)

2 (2^m - 1)

m - 1

(2m - l)/mJ

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