2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/75995The expected number of Yang-Baxter moves appearing in a reduced decomposition of the longest element of the Coxeter group of type B_n is computed to be 2-4/n. For the same element, the expected number of 0101 or 1010 factors appearing in a reduced decomposition is 2/(n^2-2).8 pages; 4 figuresCombinatorics05E15; 20F55text