Computer networks GBN

Question

Consider 2 hosts are linked by 4Mbps  channel with prob time 0.02sec.If size of each packet is 2000bits what is min window size of Gbn and Sr in order to allow sender to continuously send packet without any waiting

Im getting 81.In answer only 80 is there.The window size is 1+2a right?

Comments

Yes..sender window size: 1+2a in case of both GBN & SR

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So ur getting 81?

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it should be 81, but in ace test series they are not adding 1..just ignore it