Sir admitere

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c.adryan
Euclid
Posts: 19
Joined: Fri Feb 29, 2008 12:22 pm

Sir admitere

Post by c.adryan »

Fie sirul \( a_n=\sum_{k=1}^n{\frac{k(k+1)}{2x^{k-1}}} \) si \( |x|>1 \) Calculati \( \lim_{n \to \infty} a_n \)
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