Искакова, М., Аяғанов, Ғ. and Даукен, М. 2020. An effective way to detect the sum of the first n term of an arithmetic progression. Pedagogy and Psychology. 44, 3 (Sep. 2020), 182–187. DOI:https://doi.org/10.51889/2020-3.2077-6861.23.