Alsina C, Monreal A. Proof without words: (a + b)^3 = a^3 +3a^2b +3ab^2 + b^3. Teach. Math. Comp. Sci. [Internet]. 2003 Jun. 1 [cited 2024 Sep. 27];1(1):157. Available from: https://ojs.lib.unideb.hu/tmcs/article/view/14691