28 Apr '08 00:14

There is a circle with a diameter of 2. What is the exact average (not in decimal form, but in fraction) of all possible distances between 2 randomly chosen points in the circle?

You have a week. I suspect someone'll get it before then, but I don't know. It was difficult for me to solve.

You have a week. I suspect someone'll get it before then, but I don't know. It was difficult for me to solve.