N-chi uchburchak sonini birinchi n-chi tabiiy sonlarni qo'shish orqali topish mumkin. N-chi uchburchak sonining formulasi, $T_n$, quyidagicha berilgan: $T_n = 1+2+3+...+n = \frac{n+1}{2}$$ Biz ushbu formulani birinchi n-chi tabiiy sonlarning yig'indisini ko'rib chiqish orqali isbotlashimiz mumkin, ya'ni: $T_n = 1+2+3+...+n$$ Agar biz ushbu yig'indini o'z-o'ziga qo'shsak, lekin tartibni o'zgartirsak, biz quyidagilarni olamiz: $T_n = (1+2+3+...+n) + (n+(n-1) + (n-2)...+$1) Shundan $T_n = (1+n) + (n
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