WSsize =32KB
threshhold value = 32/2=16 KB
as MSS = 2KB
START FROM 2 KB
2, 4 , 8, 16(THRESH HOLD VALUE),17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32
NOW CALCULATE RTT BETWEEN ABOVE = 19 + 1= 20
THESE +1 IS BECAUSE GET BACK TO 32 AS MENTION INTO THE QUESTION