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p persistant CSMA/CD

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There are 10 stations in a LAN always having constant load, ready to transmit. During any particular contention slot, each station transmits with a probability of 0.1. If the average frame takes 122ms to transmit, what is the channel efficiency, if the round trip time is 51.2 microseconds?

A) 0.23            B) 0.35            C) 0.48                   D) 0.56                  

As per the answer key, the answer is given as C...      

Can anyone share the solution to this problem?
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