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Cn : Calculate number of transmissions in SR and GBN

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Station A needs to send a message consisting of 10 packets to station B using a sliding window of size 4. All packets are ready and can be transferred immediately.Selective repeat and GBN are used at 2 different times and every 5th packet get lost for both protocols.(ACK's from B never get lost).Let x and y be the number of transmissions that A has to make in selective repeat and GBN respectively to ensure safe delivery to B.Then what are the values of x and y?
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x=12 (SRA) and y=26 (GBN)

x+y= 38 corrct answer

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