starting from 2 MSS we proceed 2-4-8 after third tranmission we will reach threshold 12 MSS from where additive increase will start
now 12-13-14-15 during 7th transmission we get time out means threshold will be floor(15/2)=7
now start for 8 transmission with intial segment size=2mss
2-4-7-8-9-10 so at the end of 12th transmission answer is 10mss