Quljanov Jaxongir Baxtiyorovich, Normurodova Zuxra. KOMBINATORIKA ELEMENTLARI VA UNING HAYOTDA QOʻLLANILISHI . ta’lim. 2025;45(1):71-74. Accessed January 23, 2026. https://scientific-jl.com/tal/article/view/12545