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 May 13th, 2017, 11:20 AM #1 Newbie   Joined: Dec 2016 From: Morocco Posts: 2 Thanks: 0 Help With sequences and series. Forgive me if this is the wrong section for this, but I study maths in French. This is about sequences and series; to be more precise, it is about finding their nature, which is either divergent or convergent, by using different methods (Cauchy, D'Alembert, Reiman...). I study maths in French, so some things might not make sense since they are directly translated by me, but after all maths is one language. I want to determine whether this sequence is convergent or divergent: Un= Last edited by skipjack; May 13th, 2017 at 09:27 PM.
May 23rd, 2017, 03:45 AM   #2
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 Originally Posted by MisterMaths Forgive me if this is the wrong section for this, but I study maths in French. This is about sequences and series; to be more precise, it is about finding their nature, which is either divergent or convergent, by using different methods (Cauchy, D'Alembert, Reiman...). I study maths in French, so some things might not make sense since they are directly translated by me, but after all maths is one language. I want to determine whether this sequence is convergent or divergent: Un=
Use the general formula $x^n- y^n= (x- y)(x^{n-1}+ x^{n-2}y+ \cdot\cdot\cdot+ xy^{n-2}+ y^{n-1})$ with $x= \sqrt[n]{n+1}$ and $y= \sqrt[n]{n}$.

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