Tính giới hạn của dãy số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDamaaBa % aaleaacaWGUbaabeaakiabg2da9iaacIcacaaIXaGaeyOeI0YaaSaa % aeaacaaIXaaabaGaamivamaaBaaaleaacaaIXaaabeaaaaGccaGGPa % GaaiikaiaaigdacqGHsisldaWcaaqaaiaaigdaaeaacaWGubWaaSba % aSqaaiaaikdaaeqaaaaakiaacMcacaGGUaGaaiOlaiaac6cacaGGOa % GaaGymaiabgkHiTmaalaaabaGaaGymaaqaaiaadsfadaWgaaWcbaGa % amOBaaqabaaaaOGaaiykaaaa!4C2E! {u_n} = (1 - \frac{1}{{{T_1}}})(1 - \frac{1}{{{T_2}}})...(1 - \frac{1}{{{T_n}}})\) trong đó \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaBa % aaleaacaWGUbaabeaakiabg2da9maalaaabaGaamOBaiaacIcacaWG % UbGaey4kaSIaaGymaiaacMcaaeaacaaIYaaaaaaa!3EA4! {T_n} = \frac{{n(n + 1)}}{2}\).

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