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GO Classes Test Series 2024 | Mock GATE | Test 11 | Question: 32

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On a wireless link, the probability of successfully sending a packet is $0.1.$ A stop-and-wait protocol is used to transfer data across the link. The channel condition is assumed to be independent of transmission to transmission. What is the expected number of packets that experience timeout to send one packet? (Timeout occurs on unsuccessful transmission)
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All India Mock Test 2 - Solutions Part 1

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we have to calculate the no of trials we need to send 1st packet -1
so using tree method expected trials for 1st successful transfer is 1/p where p=0.1

expected no of trials is 10 but 10th one is successful transmission for the last 9 transmission there is unsuccessful transmission so the answer is 9.
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