Compute the sum $\sum_{k=1}^{10}{\frac{k}{2^k}}$
6416
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
17056
How to find answer to the sum of series $\sum_{n=1}^{\infty}\frac{n}{2^n} $
100936
What is the sum of this series: $\frac{2}{\pi}\sum_{k=1}^{\infty}\frac{(-1)^{k-1}}{2k-1}$
108694
Efficient computation of $\sum_{i=1}^{i=\left \lfloor {\sqrt{N}} \right \rfloor}\left \lfloor \frac{N}{i^{2}} \right \rfloor$
119552
Summing Finitely Many Terms of Harmonic Series: $\sum_{k=a}^{b} \frac{1}{k}$
63863
Evaluate: $\sum_{n=1}^{\infty}\frac{1}{n k^n}$
29524
Formula for the sum $\sum_{i=2}^{n} \frac1{i^2-1}$
5054
Calculate $\sum\limits_{k=0}^{\infty}\frac{1}{{2k \choose k}}$
36361
How to calculate the summation $(\sum_{p = k}^{n} \binom{n}{p}) / 2^n$ quickly?
30895
Compute the sum of the series $\sum_{n=1}^{\infty} \frac{1}{n \cdot 2^n}$
68080
Evaluation of $\sum_{k=0}^n{n\choose k}^2u^k$
99420
Compute $\sum_{n=1}^\infty \frac{1}{(n+1)\sqrt[]{n}+n\sqrt[]{n+1}}$
49028
Find the sum : $\frac{1}{\cos0^\circ\cos1^\circ}+\frac{1}{\cos1^\circ \cos2^\circ} +\frac{1}{\cos2^\circ \cos3^\circ}+......+$
123955
How to compute $\sum\limits_{k=0}^n (-1)^k{2n-k\choose k}$?
53658
Find the sum series $\sum_{n=1}^{+\infty} \frac{(-1)^{n-1}(2n-1)}{2^{n-1}}$
67752
Show that $\sum_{n = 1}^{+\infty} \frac{n}{2^n} = 2$
6838
Evaluate the series $S_n = \sum_{k=1}^n\log\frac {k (k + 2)}{(k + 1)^2}$