Evaluate Geometric Sum
6416
How can I evaluate $\sum_{n=0}^\infty(n+1)x^n$?
69194
Partitioning sum of squares
27637
How can I apply Newton's sums to solve this problem?
63863
Evaluate: $\sum_{n=1}^{\infty}\frac{1}{n k^n}$
19776
Simplify a combinatorial sum
156720
Evaluate $\sum_ {n=1}^{\infty} \cot^{-1}(2n^2)$
26790
Proving the geometric sum formula by induction
89561
Find the sum of angles without trigonometry?
80201
Geometric series sum $\sum_2^\infty e^{3-2n}$
2799
Question about arithmetic–geometric mean
72502
Evaluate $\sum_{n=1}^\infty nx^{n-1}$
56365
Evaluate $\sum\limits_{k=1}^{n} \frac{k}{2^k}$
114414
Sum of $\sum_{k=1}^n\sin{k\theta}$
140877
Evaluate the sum $\sum_{k=1}^n {n \choose k-1} {n \choose k}$
137109
Evaluating a summation of inverse squares over odd indices
50051
Interpret geometrically the equation
130083
Evaluating sum of a combination series