oo ___ \ ` \ n - 1 / n*p /__, n = 1
Sum(n*p^(n - 1), (n, 1, oo))
/ p | -------- for |p| < 1 | 2 | (1 - p) | | oo < ___ | \ ` | \ n | / n*p otherwise | /__, |n = 1 \ ------------------------ p
Piecewise((p/(1 - p)^2, |p| < 1), (Sum(n*p^n, (n, 1, oo)), True))/p
x^n/n
(x-1)^n
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
csc(n)^2/n^3
1/n^2
1/n^4
1/n^6
1/n
(-1)^n
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
(-1)^(n + 1)/n*x^n
(3*n - 1)/(-5)^n