BASIC RULES USED IN TEACHING ELEMENTS OF COMBINATORICS IN PRIMARY EDUCATION MATHEMATICS LESSONS. Scientific journal of the Fergana State University, [S. l.], v. 31, n. 2, p. 25, 2025. Disponível em: https://journal.fdu.uz/index.php/sjfsu/article/view/6453. Acesso em: 9 jan. 2026.