2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/65947We study characteristic polynomials of symmetric matrices with entries ${i+j\choose i}$ the binomial coefficients, over finite fields.16 pages, added reference, changes in presentation, correction of an error in a proofNumber TheoryCombinatorics11C20, 11T99text