Mister Exam
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How to use it?
- Sum of series:
- t^k*(-1)^k*a^(2*k)*cos(a*x)*e^(a*z)/factorial(k)
- (-1)^nx^n/n!
-
5/(25*n^2-5*n-6)
- ((3*x)^n)/n!
-
Identical expressions
- one /((n^(n- one))+ one)
- 1 divide by ((n to the power of (n minus 1)) plus 1)
- one divide by ((n to the power of (n minus one)) plus one)
- 1/((n(n-1))+1)
- 1/nn-1+1
- 1/n^n-1+1
- 1 divide by ((n^(n-1))+1)
-
Similar expressions
- 1/((n^(n+1))+1)
- 1/((n^(n-1))-1)
Sum of series 1/((n^(n-1))+1)
The solution
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oo ____ \ ` \ 1 \ ---------- / n - 1 / n + 1 /___, n = 1
$$\sum_{n=1}^{\infty} \frac{1}{n^{n - 1} + 1}$$
Sum(1/(n^(n - 1) + 1), (n, 1, oo))
The radius of convergence of the power series
Given number:
$$\frac{1}{n^{n - 1} + 1}$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = \frac{1}{n^{n - 1} + 1}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty}\left(\frac{\left(n + 1\right)^{n} + 1}{n^{n - 1} + 1}\right)$$
Let's take the limit
we find
$$\frac{1}{n^{n - 1} + 1}$$
It is a series of species
$$a_{n} \left(c x - x_{0}\right)^{d n}$$
- power series.
The radius of convergence of a power series can be calculated by the formula:
$$R^{d} = \frac{x_{0} + \lim_{n \to \infty} \left|{\frac{a_{n}}{a_{n + 1}}}\right|}{c}$$
In this case
$$a_{n} = \frac{1}{n^{n - 1} + 1}$$
and
$$x_{0} = 0$$
,
$$d = 0$$
,
$$c = 1$$
then
$$1 = \lim_{n \to \infty}\left(\frac{\left(n + 1\right)^{n} + 1}{n^{n - 1} + 1}\right)$$
Let's take the limit
we find
False
False
The rate of convergence of the power series
The graph
Examples of finding the sum of a series
- The Sum of the Power Series
x^n/n
(x-1)^n
- Factorial
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
- Flint Hills Series
csc(n)^2/n^3
- Basel problem
1/n^2
1/n^4
1/n^6
- Harmonic series
1/n
- Grandi's series
(-1)^n
- Alternating series
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
- Newton–Mercator series
(-1)^(n + 1)/n*x^n
- Exam the series for convergence
(3*n - 1)/(-5)^n