I appeared in delhi and my exam was conducted in center no. 2 the second portion of army public school.
The Delhi center was divided in 2 parts center 1 and center 2.
I saw the serial number @ center 2 the last one was 1750.
That means 1750 were called to appear @ delhi.
some people applied for the exam 3-4 times with different details so they were given 2-3 roll numbers ( this includes few of my frnds)
So I think around 1500 appeared in delhi