Bu $T (n) $ uchun formula $\frac{n}+1) {2}$ ekanligini isbotlash uchun biz quyidagi qadamlardan foydalanishimiz mumkin: 1-qadam: Summani oldinga va orqaga yozing va ularni bir-biriga qo'shing: T (n) = 1 + 2 + 3 +... + T + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $ + n $... (Bu ikki tomonlarni bir-biriga qo'shish uchun quyidagi formulalardan foydalanishingiz mumkin: 1-qadam: Summani oldinga va orqaga yozing va ularni bir-
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