2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62998Two points are randomly selected inside a three-dimensional euclidian cube. The value l of their separation lies somewhere between zero and the length of a diagonal of the cube. The probability density P(l) of the separation is obtained analytically. Also a Monte Carlo computer simulation is performed, showing good agreement with the formulas obtained.7 pages, 5 figuresGeneral MathematicsAstrophysicstext