PROOF WITHOUT WORDS: RELATIONSHIP BETWEEN THE SUM OF NATURAL NUMBERS AND THE SUM OF THE PRODUCT OF TWO CONSECUTIVE INTEGERS. Far East Journal of Mathematical Education, [S. l.], v. 22, p. 1–3, 2022. DOI: 10.17654/0973563122001. Disponível em: https://pphmjopenaccess.com/fejme/article/view/655. Acesso em: 5 jan. 2026.