2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135565We determine the smooth concordance order of the 3-stranded pretzel knots P(p,q,r) with p,q,r odd. We show that each one of finite order is, in fact, ribbon, thereby proving the slice-ribbon conjecture for this family of knots. As corollaries we give new proofs of results first obtained by Fintushel-Stern and Casson-Gordon.21 pages, 5 figures. Significantly expanded version, mistake in previous proof correctedGeometric Topology57M25, 57M27text