Solving $\sum_{k=1}^{n} k \Big( \frac{3}{2} \Big)^{k-1}$
562
Formula for calculating $\sum_{n=0}^{m}nr^n$
37007
Evaluating $\sum_{k=1}^{n} \frac{1}{k(k+1)}$
91784
Calculating $\sum_{n=1}^\infty {\frac{1}{2^nn(3n-1)}}$
16967
Sum : $\sum_{n=0}^\infty \frac{(-1)^n}{(2n+1)^3}$
126105
Compute $\sum_{k=1}^{n} \frac 1 {k(k + 1)} $
30851
Find the summation $\frac{1}{1!}+\frac{1+2}{2!}+\frac{1+2+3}{3!}+ \cdots$
151085
Simplify the sum $ \sum_{i=0}^{k}(-1)^i i \binom{n}{i} \binom{n}{k-i}$
44111
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
57503
How find $\sum_{k \in A} \frac{1}{k-1} $ for $ A = \{ m^n| \text{ } m, n \in Z \text { and } m, n \ge 2 \} $
49052
Find $\sum_{n=1}^\infty \frac{n^3}{n!}$.
119552
Summing Finitely Many Terms of Harmonic Series: $\sum_{k=a}^{b} \frac{1}{k}$
53658
Find the sum series $\sum_{n=1}^{+\infty} \frac{(-1)^{n-1}(2n-1)}{2^{n-1}}$
19581
$\sum_{k=0}^n (-1)^k \binom{n}{k}^2$ and $\sum_{k=0}^n k \binom{n}{k}^2$
20299
Is $k=3$ the only solution to $\sum_{r=1}^n r^k =\left( \sum_{r=1}^nr^1 \right)^2 $?
78632
Summation equation for $2^{x-1}$
134311
How to determine equation for $\sum_{k=1}^n k^3$
71824
Finding the sum of the series $\frac{1}{1!}+\frac{1+2}{2!}+\frac{1+2+3}{3!}+ \ldots$