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Sir admitere
Posted:
Mon May 25, 2009 4:47 pm
by
c.adryan
Fie sirul
\( a_n=\sum_{k=1}^n{\frac{k(k+1)}{2x^{k-1}}} \)
si
\( |x|>1 \)
Calculati
\( \lim_{n \to \infty} a_n \)