just remember two points-
1- when time out occures (severe case) then senders renew the thresold window size and start from slow phase
2- when duplicate ack occures(light congestion) then sender renew the thresold window size and start congestion avoidance phase after from new thresold window
now answer – 1- 2 kb, 2 – 4kb, 3 - 8kb, 4 - 16kb, 5 - 32, time out now new thresold window set to 32/2 = 16kb
and congestion avoidance phase will start from here that is increase gradually
6- 16kb , 7- 18kb, 8 – 20kb , 9 – 22kb , 10 – 24kb so at the end of 10th window size is 26 kb