Posted by Brenda on .
n points are arranged on a cirlce and all the chords drawn. Let I(n) be the number of intersection points inside the circle if no 3 chords are concurrent. Find a formula for I(n).

math 
Reiny,
Brenda, I went through considerable time answering this question for you, and you even thanked me for it
http://www.jiskha.com/display.cgi?id=1359819774
Now I see you posting the same thing all over again.
What gives?