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packets are being transmitted using GB5 and here every 4th packet is lost.How many packets need to be transmitted to transmit 10 packets?

my answr 18 given :20
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Explanation:
1 2 3 (4 5 6 7 8) 9 10 – first loss (Here total Transmission is 8)

4 5 6 (7 8 9 10) – second loss  (Here total Transmission is 7 )

7 8 9 (10 .. ) – Third lost   10 (Here total Transmission is  5 )

(HERE TOTAL TRANSMISSION IS 8+7+5=20)

Hence a total of 20 transmissions will be required.
 

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