Let H be a collection of n hyperplanes in d-space in general position.
For each tuple of d + 1 hyperplanes of H consider the open ball inscr
ibed in the simplex that they form. Let B(k) denote the number of such
balls intersected by exactly k hyperplanes, for k = 0, 1, ..., n - d
- 1. We show that \B(k)\ = (n - k - 1/d).