2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/122900We study the cutoff phenomenon for generalized riffle shuffles where, at each step, the deck of cards is cut into a random number of packs of multinomial sizes which are then riffled together.26 pages, to be published in Random Structures and AlgorithmsProbability60J05text