PUTRA, Aan; ZULKARDI; PUTRI, Ratu Ilma Indra; LASWADI. Secondary students’ informal strategies in solving enumeration problems prior to formal combinatorics instruction. Jurnal Elemen, [S. l.], v. 11, n. 4, p. 898–911, 2025. DOI: 10.29408/jel.v11i4.31088. Disponível em: https://e-journal.hamzanwadi.ac.id/index.php/jel/article/view/31088. Acesso em: 26 nov. 2025.