2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161240In a recent paper \cite{Gl} A. Glibichuk proved that if $A,B$ are subsets of an arbitrary finite filed $\F_q$, such that $|A||B|>q$, then $16AB = \F_q$. We improve this to $10AB = \F_q.$4 pagesCombinatorics11T, 52Ctext