Computer Networking
A group of 2m - 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.

(2m - l)/mJ
2 (2m - 1)
m - 1
2 (m - 2)

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Computer Networking
Demodulation is the process of

combining many low speed channels into one high speed channel
dividing the high-speed signals into frequency bands
None of these
converting digital signals to analog signals
converting analog signals to digital signals

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