Find the average distance between 2 points on the surface of a sphere of radius r.
Hint: Fix one point, integrate the distance from this point to a general point over the surface of the sphere using spherical co-ordinates.
Find the average distance between 2 points on the surface of a sphere of radius r.
Hint: Fix one point, integrate the distance from this point to a general point over the surface of the sphere using spherical co-ordinates.
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