THE ANSWER IS 14.
THE WINDOW SIZE IS 5.
NO.OF PACKETS TO SEND IS 10.
SO THE FIRST 5 PACKETS WILL BE SEND SUCCESSFULLY. (1,2,3,4,5)
NEXT,THE REM PKTS(6,7,8,9,10) WILL BE SEND. IN THAT 7TH PKT FAILED. SO THE REMAINING PKTS GET DISCARDED.ONLY 6TH PKT IS SEND SUCCESSFULLY.
SO, THE REM PKTS(7,8,9,10) IS SEND IN NEXT ROUND SUCCESSFULLY.SO TOTALLY (1,2,3,4,5,6,7X,8D,9D,10D,7,8,9,10 [X=FAIL,D=DISCARDED]) 14 TRANSMISSION OCCURS.